I for one am a builder, and vote for building (rebuilding), i learned to fly about 19 years ago, when i was learning, i crashed so much that i had to get an Assembly line going, i remember rebuilding a plane 24 times, and it got pretty heavier, slowly quit crashing so much, but the assembly line kept going till i came to the conclusion, i'm running out of room,....when you build, you know the plane inside and out, paul.