The hardest kit that I have ever built was a Stearman PT 17 from a Sterling Kit. This had to be the method used to build the first full scale of this plane. Everything was bend this piece to fit, cut to fit, or the nose was bend and cut to fit with two different radials. Everything was balsa with the fuse being built in two parts and then the two halfs were put together. I'm glad they are out of buisiness now. I worked on that plane for about three years, I would be flustered and would put it up for a while and then start again. I build two other planes during the time I was working on the Stearman.

What a Hobby, you don't have to be a little crazy, but it helps.