There's also the Beta Whistler AXP64 Build which was used to port Windows over to 64-bit before there was any 64-bit hardware available that could run NT. The people in the virtuallyfun discord got that running (I am part of that! I have an AlphaServer 800 5/500 next to me, with some hacks to the setup and telling it what HAL DLL to load it installed perfectly!)