Looks like it should be a fun build! I just completed something similar myself with a Univega Alpina Pro. Mine came with the original fork, but that only had fender mounts and I also wanted as many mounting points as possible. The original fork had an axle to crown of around 410mm, so I wanted to match that as closely as possible. I hunted around for a while and ended up going with a Surly troll fork as it fit all my requirements (420mm atc to nearly match the original geo, v-brake/canti posts, excessive amount of mounting points). So far I've been quite satisfied with it and I'd definitely recommend it as a viable option.