Advice Looking for SFF parts suggestions for my upcoming build

[Ariamella]

I just want to fit a full-sized graphics card with a glass panel to show off my parts. Larger parts compatibility (e.g. full-size air coolers, ATX PSUs and mATX motherboards) is desirable. I live in Hong Kong so ordering from Taobao/Tmall is convenient for me.
I plan to use it with these parts:

• AMD Ryzen 4700, gonna use an old AMD CPU as a stopgap until it comes out
• Gigabyte B550I Aorus Pro AX or MSI MPG B550I Gaming Edge Wifi
• Crucial Ballistix RGB 16 GB (2 x 8 GB) DDR4-3600 CL16
• Kingston A2000 1TB (already have this)
• Undecided number of other NVMe, 2.5" or 3.5" drives depending on what case I go for
• Corsair SF600 PT
• RTX 3060 or 3070 when it releases, gonna use an old GTX680 as a stopgap until it comes out

So far I've got these cases on my shortlist:

• Sunmilo C01: 280mm x 185mm x 235mm = 12.17L, 160mm clearance, fits very fat coolers so much more freedom of choice and lets me customize the exterior! Accepts 120mm fan in the back and seems to also accept them in the top if I customize it with a vented top, allows for vented front options too, long wait time though
• Captain S V2: 318mm x 140mm x 251mm = 11.17L, 240mm AIO support, looks beautiful and supports full-sized GPUs plus a full-sized fan in the bottom, barely any drive support though

And I'm thinking of using these air coolers if I get an air-cooling case:

• Thermalright Macho Rev.B 159mm tall
• Scythe Mugen 5 Black RGB 155mm tall

Someone's offering a H100i Pro RGB with a couple scratches and no box for HKD450, or roughly US$60, would that be good to go for?