Yeah, I think the hard part would be graphics libraries for anything 3D.

I've always had a bucket-list item along the lines of "constructing basic game playing graphics primitives from scratch using the SVGA address offset for output".

MS-DOS (and games for it) ran on 486s, at the end. Writing MS-DOS games for a computer running many hundreds/thousands of times faster would probably allow for many more different types of approaches that could not be done on slow machines.

That sounds like a fun project! Would taking something like the DOOM source code, and extracting the "3d engine" from that be a workable approach? Or in your vision of it how would you make the primitives?

I am quite sure they were running on Pentiums as well, given Michael Abrash books, and my own experience.