So i have been living in China for almost a decade now and have gone through my share of cases. I often build cases for my friends after i show them my mini ITX case at home, this has given me the opportunity to check quite a few custom cases on taobao. Here are my thoughts on them:
As a comparison, i have owned the following retail cases - Inwin 301, Inwin A1, Inwin Chopin, Inwin 901, Cougar, SKCT Q1 (yeah i like inwin)
Most case shops owners are really helpful and accommodate your requests (with the respective price difference) if you can speak/write chinese.
ZS A4
https://shop127547001.taobao.com/sh....149.145f14e3T1ePQ1&user_number_id=1579851738
My first custom case was from this shop, it was many years ago and it was one of their first batches. At the time i though it was great, thinking back the case was rough edged and sub quality. Note that my case was one of their first batches and the version i got (dancase clone) is not made anymore, looking at their current cases i believe they have changed manufacturer and they look GREAT
Formula case
https://shop115365854.taobao.com/sh...4.24.145f14e3T1ePQ1&user_number_id=1927790796
I have built both the loli 1 case and their newer SFX version. amazing quality, the feel and finish on the material is great. The only pain is that they do not use standard philip screws but hexagon ones, this is not a fault borne only to them though. The owner is REALLY helpful
Seadamaged Carbon fiber cases
https://shop65316658.taobao.com/sho...14.105.145f14e3T1ePQ1&user_number_id=76631657
This is an interesting one, the owner makes carbon fiber cases. If you dig the look, this is as good as it gets. However carbon fiber is really not the right material for cases. It feels like cheap plastic, it can't be molded easily and makes an AWFUL case to build and maintain. Plus it costs about twice as much as most custom cases. But if you dig the looks....
Turemetal
https://fanless.taobao.com/shop/vie...1.14.5.489537b8HjG2E6&user_number_id=80652918
this is not the custom case in the normal sense (you can't customise it) but the owner makes them in batches like everyone else and there is a wait time. The special part about their ITX cases is that they are all FANLESS (so forget your i7 9900k). The quality is amazing and they weight a TON for obvious reasons, the whole cases connect to the CPU as a heatsink. I build a hptc with an i3 a couple years ago, with the new AGPU from ryzen it could be a very interesting choice
Sunmilo
https://s.taobao.com/search?q=sunmilo&imgfile=&js=1&stats_click=search_radio_all:1&initiative_id=staobaoz_20190802&ie=utf8
I have built 2 sunmilo cases, one is not sold anymore "red dragon" that had a layout similar to the ncase m1 and the other is dancase copy. Superb quality, strongly believe they use the same manufacturer of Formula case. They however machine their cases much more with their patterns (down to taste), which increases their base price a lot. Between them and formula case it comes down to a matter of taste, you can always get a plain formula case and ask them to machine your own patterns...the price will become similar to the sunmilo ones. I personally really like their black/red cases
SGPC
https://sgpc.taobao.com/shop/view_shop.htm?spm=a230r.1.14.42.145f14e3T1ePQ1&user_number_id=35443409
makers of the K series (k39,k77,k66 etc). I dunno what to say, these cases are cheap but the quality is...meh, i guess similar to most retail cases with very little customisation. I personally wouldn't bother unless you are tight on a budget (shouldn't be building ITX if that was the case..). I built the k977a few weeks ago, the protruding power cable is really ugly as well.
Other items
In China the ID cooling IS 30, 40, 50 and 60 coolers are the go for budget cooling (about 15 dollars each) due to their performance and the fact you can stick any of your pmw fans on them. I like rgb fans.
APX 100 is a really popular high budget fan here, the performance is really good and you can put any 12cm fan on it. there is also a full copper version and you can get a second shop to coat it with the black stuff.
Custom cable are relatively cheap, this is the golden standard shop and one set for a dancase is usually around 138 cny, of course you choose material colour and length or you simply tell them what case you building and they will sort everything for you
https://item.taobao.com/item.htm?id=38032345491&ali_refid=a3_420434_1006:1123816774:N:+j0wmuc5PHYDthnqjzBBvyge4n/QExYvETWnj5g1swo=:d6a5ec7f0efa79494414b389377b78f0&ali_trackid=1_d6a5ec7f0efa79494414b389377b78f0&spm=a230r.1.1957635.2
Taobao is the heaven of customisation, if you are willing to explore you can get whatever you want. I have recently added a leather handle to my case (bought from a furniture handle manufacturer, dozens on the site including full custom as well) and got 2 acrylic plates with my own logo on it, both for less than 8 dollars delivered. Acrylic shops often also sell you full acrylic custom built cases similar to Geeek case for a fraction of the cost
Almost all case shops are can add your logo or size customisation, just needs to ask. For example if you have a design of theirs you really like, you can ask them to make an Matx version of the case, make panels higher because you want to mount a aio radiator etc
In addition all shops have their QQ (its like the chinese whatsapp) with their customers/fans. by joining and looking you can also get an idea of what shops are popular and also ask people to help with your build since they might already own your case (most of the chat is spam or just making fun of the owner telling them to hurry up with the deliveries)
For the future there are a few really interesting cases that i am pushing my friends to buy (and me to build)
Smallest One
https://item.taobao.com/item.htm?sp...M8ou7d&id=558710712904&ns=1&abbucket=6#detail
This is considered the holy grail of custom cases in China ITX community, i asked the shop owner but he has a 5 months waiting time... on the second hand market you can find it at double the price
LOUSU
https://lousu.taobao.com/shop/view_...14.55.145f14e3T1ePQ1&user_number_id=601931423
I really like the sleek design of this case
OldK
https://shop445541697.taobao.com/?spm=2013.1.1000126.2.43d52e518fzy2v
This shop is quite famous as well and relatively old, never tried them but by looking at their parts and photos i believe they also use the same manufacturer of loli and sunmilo, particularly interested in their k03 case.
loli2s
https://item.taobao.com/item.htm?spm=a1z10.1-c-s.w4004-21298505569.12.4e8c4d1fUrDo14&id=595635971513
this looks really cool, i know the design is copied but this smaller form factor looks even better to my eyes
Feel free if you got any questions, i am not sure if taobao is competitive in your country after shipping costs taken into account, for me however it has really changed the way i can do with my builds, if you are looking to customize, you can find whatever you need.