Btw I think these benchmarks are the ones (Un)Principled Technologies made, and probably even the 1st set (ie the worst - as in artificially slowing AMD's CPUs).
It's very true that 9900K is completely pointless for gaming (unless you really want some extra frames at 1080p for super high fps and have nothing better to do with your $$$).
But my main motivation for a SFF build is to make a single machine to handle both my work & gaming, which I'm sure the 2700X would handle just fine too
If Intel can't deliver the 9900K to under their own MSRP of $500 before the end of the year I'm not going to wait for them
(and quite possibly will get some CPU+MoBo combo if I find good BlackFriday/CyberMonday deal)
Now about DIY S4Mini with MakerBeam/MicroRax:
I don't know about MicroRax, because I couldn't ever open their site ... hahaha
But MakerBeam are very decent. Good quality & little cheaper than MakeBlocks (well beam profiles are cheaper, but the rest is more expensive so it can balance out).
I made myself a test frame with size 32x30x12cm with 8x30cm & 4x10cm beams, and 8 corner plates.
The beams are 1010 profile (MakerBeam have also 1515 but I prefer the thinner profile and in my opinion it's plenty strong)
pack of 4 of the 30cm is €9,50, so 8 would be €19 (
https://www.makerbeam.com/makerbeam-300mm-4p-black-makerbeam.html)
the 10cm beams are 16 in a pack for €12,25 (
https://www.makerbeam.com/makerbeam-100mm-16p-black-makerbeam.html)
I used these brackets 12 for €6,95 (
https://www.makerbeam.com/makerbeam-90-degree-brackets-12p.html)
Also have 4 of these nuts-stands €4,95 (
https://www.makerbeam.com/makerbeam-knurled-nuts-4p.html)
The T-slot nuts are the secret sauce for these beams
but they're rather expensive for nuts:
25 for €14,25 (
https://www.makerbeam.com/makerbeam-t-slot-nuts-for-makerbeam-25p.html) if you can find them in a regular store I bet they'll be cheaper. Also I'm not sure if 25 would be enough for a build.
But you can also use these screws (
https://www.makerbeam.com/makerbeam-square-headed-bolts-6mm-250p-for-makerbe.html) as their heads can slide in the T-Slot but square head makes it easy to tighten/loosen.
Another cool mounting option for the outer corners is with these corner cubes (
https://www.makerbeam.com/makerbeam-corner-cubes-12p-clear-for-makerbeam.html). Just have to account for the extra 1cm they add, and I don't think you can use them for mounting anything else but corners.
So the minimum for a frame like the above I guess would be about €45~50, but can grow a lot if you get lots of beams, plates & nuts just for the fun of it
And don't forget the €17 shipping inside EU :/
For outside EU you have to check, but I guess at least you might save some VAT perhaps?
For something with exact size as the S4Mini you'll have to get longer than 30cm beams and cut them to S4Mini-ish size.
Cutting aluminium seems to be easy. Just keep in mind that the threaded hollow core (ie the threaded hole in each beam) is only threaded for few cm on each end, so when you cut it you'll probably need to make new threading yourself. Shouldn't be too difficult with proper tools.
They also have some Plexi sheets (
https://www.makerbeam.com/polycarbonate-sheet-transparent-1p.html), but I think only in mid sizes (300mmx200mmx3mm) so they might come a little short for S4Mini sizes, or you'll have to stack them. But for the walls there probably many other options at your local hardware store.
I think both MakerBeam 1010 profiles & the MakeBlocks are very good options (but MakeBlocks might require less cutting), though to keep the price low you'll need to know exactly which and how many parts to get ... which I didn't so I'm playing around with both
That's why I'll post more detailed guide for my build (when I get it to more complete stage) so that anyone that likes it can order only the necessary parts for it and save themselves €100~150