MNT Reform Next mainboard, version 5! now with 2x SSD slots, especially one for (up to) 2280 size. that one has 4x PCIe 3.0 lanes routed to it with the RK3588. minor checks and cleanups tomorrow. then, steadily towards production!
(lol, of course after posting i notice that the 2280 mounting thread should be on the other side :D luckily that's just one keypress in kicad)