HE just flush out the engine with fresh fuel by removing the plug and dripping fuel in through the carburator and spin a bit with the starter.

As far as the airplane goes that rather interesting bow in the fin while remaining vertical is a complete non issue, Heck I think it gives the airplane a little character.

The mismatch in the wing root as the others have noted is also of not much concern. Just finish her up and as SeamusG suggested "go fly with your local instructor"

John