you need to go to homage forum dot com
plenty of older pocket watch movements there: hammies (917 and 921), corteberts 616 and 618 (the odd 620) and of course the obligatory molnija 3601, 3602 builds
most of the components you need (as well as good tutorials) are here in www.vintagewatchparts.com
for any once-off pieces (specific movement rings etc.) wither gordon (above) can do for you or else another hf member athaya can fabricate