" simply 'flipping around' the main gear so that it angles backwards and is mounted to the back of the spar, and then adding a nose wheel "
Sounds easy doesn't it? That is how you create a tri-gear KR2, although my understanding is that sentence probably covers a couple hundred hours of work. Welcome to the group. I'm sure you'll find lots of help here as you progress through your conversion. Cheers, Tony King Queensland Australia