When I build,( usually kits), on purpose, I don't round up all the parts needed. While building, when I come to a spot that needs a part, extra pc of balsa, a roll of covering,etc. that I don't have. The trip to the LHS, or wating for the UPS guy, gives me the break that I need, so that I don't get "obsessed" with it. Sometimes I get on a roll & can't stop working on it. I have to make myself walk away. I hate it when I get in that "mode" cause it takes all the fun out of it for me. Oh,yeah, my wife don't like it either. Gotta keep the little lady happy !!!