Hi waross,
I finished my CG 10/300 about six weeks ago. It was one of the easier builds I have undertaken so I put more effort into getting the covering and trim as defect free as I could.
The model flys superbly with a Saito 125A. I recommend you go with the kit. One tip the centre of gravity as per the plans is more than two inches forward of where mine is now and I'm still experimenting.
Cheers,
Colin