No, but if you install the piston/ring, crankshaft/connecting rod, bearings, cylinders, and carburator, did you "build" an engine or assemble one. Do you need to cast and machine the parts to be able to claim you built it?

I have both kit built and ARFs. I personally prefer ARFs. I prefer flying to "building". Building gives me an emotional attachment to the aircraft I "built" because of all the time invested. It hurts alot more if I loose a plane I built - only loose a some money if I loose an ARF (no emotional attachment). I have personally never had an ARF suffer a structural failure, and I fly very aggressively. I am a blender and tumbling nut. I did have a 1/4 scale cub I built from a kit suffer from total structural failure (hit the ground at full throttle):-)