Yeah if I had a square pack rather than a flat pack I think I could have gotten the battery further back in the fuselage, but I can't complain with only the addition of .77 ounces to the tail to bring it into balance. I did convert the landing gear to a conventional tail dragger and lost the weight of the nose wheel, which I think helped. I know one thing, if I didn't push the battery that far back, I would have had to add 3 ounces of weight to the tail to bring it into balance. So I feel I did good. With a little surgery it would not be too bad moving the firewall (former F1) back, and it would be easier to bring the Avistar into balance. But whatever it takes, it's worth it.