A nice find and all, and worth it for the switches alone, probably. Just do keep in mind that the seller lists it as "as-is, not working". The seller claims to have not tested it, but it seems unlikely to me that someone who trades that heavily in vintage electronic hardware wouldn't have an AT->ps2 adapter lying around to test with. It could definitely be the case that he doesn't have one since he doesn't trade in vintage computer gear primarily, but it still strikes me as odd given the seller.
So long as you're okay with possibly receiving a nonfunctional board, you should be fine. It's worth it in parts, could be fine (or easily repairable), or just nice to hang on the wall to look at while sipping sherry and reminiscing about the "good old days" with some greybeards.
