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I have a 4u, not a 3u, but sliger has one now that should be pretty good. https://www.sliger.com/products/rackmount/3u/cx3151a/ has a riser for doing a modern (heh) sized graphics card.

That looks cool, but no HDD backplane.. where do you put the drives?

They have variations with cages if you need them. They're great!

Sliger makes good stuff I have their SM550 SFF case and it was really well put together, makes heck of a compact machine.