Oh right, I didn’t read far enough to see there’s no DRAM support - very unusual for a 286 system (at least a PC-compatible one). That’s a big tradeoff, indeed. Thanks!
Personally Im also a fan of keeping ram oldschool. I even reverse engineered a ram card for a 386 board just last week https://github.com/raszpl/386RC-16
(Re your 386 RAM board: Nice necroproject!)