Sure, lots of times. I build many different things, wood ships, plastic cars, stick n tissue aircraft, and all kinds of paper. I usually solve the block by shifting to another medium for a while or resorting to pulling out a kit from my stash and looking at some reference material saying I think I'll do that next but I should finish what I was working on first. Usually works but then again I have 15 started project after a quick count just looking around.