I say do the preliminary W&B before making any changes, because, otherwise, you will just be guessing.
+++++++++++++++++ You can always get some idea of the CG location by seeing where it actually balances. Don't poke any holes in the bottom wing skins, but gently resting it on two trestles will give you a good indication. Make sure there is a spar, ply rib or something where it rests. Some scrap foam will help here. Not sure I want a battery anywhere behind me - just in case there is a sudden stop. Steve J
