There's several threads on this plane, includeing one I did in the FF section with mods.

Short version: To get CG right, place rx and bat under aft edge of wing, you'll have to make a hatch. Throw away engine mount, buy fiber mount and bolt engine mount to firewall, add strenth to firwall. By not useing that stupid plywood thing, you can easily place a REAL tank in the nose, 6oz Dubro fits perfect!