One thing to point out - UAE won't run on Windows 3! At that point the top Win95 driver enabled hardware, with a minimal install (20Mb is doable if you really strip it down), would fly and run UAE.
Nothing to stop you using a top new processor & MB, and just using older sound, video and network cards, make UAE the shell, and it's as close as you could get to a PC behaving like an Amiga ... have they done the Catweasel support for UAE yet?