Yeah man, I found a good front bumper in the local scrap yard. Haven't looked for a rear yet. If I can't find a rear, I'll make something and get it chromed.
Seals, probably your best bet is Steele Rubber https://www.steelerubber.com/search...=g10&style=3-door-standard-cargo-van
Haven't found a reproduction source for the pop-out window seals, but Scrojira used this stuff in his and it looks like it worked well. Probably going to go the same route on mine. Trim-Lok 6100B3X1-8A https://www.vanning.com/threads/ubbthreads.php/topics/761621/183.html
As for the dash, mine is going to need some work as well, but I'm not sure what route I want to go yet. I even have a spare, but it's not in great shape either. I have even mulled over the idea of cutting a dash out of a scrap hot rod in the junkyard or something and making it work. Dunno.