Sean
Thanks. The bottom access on the stabs is something I wish I'd done. I also reinforced the spar receivers (captured them) though I once witnessed a crash of one these that left little doubt that the spar system is a highly unlikely failure point, even with twin P-120s on board. As for your other changes, were they for safety/functionality concerns? Particularly moving the servos?
Are you planning to use the scale bottom hinging on the wings? If so, how much concern do you have about either the resulting shortness of the aileron horn or compromised trailing edge cap (if the horn is of decent length)?