I guess I lucked out.
My rat came pretty much complete (minus fenders, tank and bling), as a 1960s something Western Flyer space frame, originally yellow then bombed black, now showing both. The saddle is not pristine, but sevicable, and a spotty rusty patina on the chrome. It is straight, and once the mountain bike tires are replaced with some roadies and the bearings all cleaned and repacked it will be a runner. Im torn between leaving it half rat or spiffing it up, I will let time tell, though right now Im liking the look as a boardtracker rat.
I learned through my motorcycle years to get something mostly all there and be on the road sooner, then mod as you go, and as bits show up, otherwise the odd bit you need keeps it from happening for way too long. I did the same with my BSA and Raleigh Sports, mostly complete runners that need some love and on the road quick. Maybe at my age I dont have the patience for the potential long project anymore.