I feel I can include myself in this thread now that I've scratch built a fuse (granted it has a C/F tail boom) and built a modern wooden 2M sailplane (Chrysalis) along with my long departed and beloved Gentle Lady and more recently Sophisticated Lady. I get at least half of the relaxation and enjoyment out of modeling during the building process. Probably comes with being an engineer by trade. I write software so I'm solving problems all the time. What do I do when I get home? Solve more problems, just smaller ones.