Trial CG. I put the turbine as far forward as it would go on the mount. The pic shows where the batteries were, there is room to move them another 4" forward. So, I think you could easily get away with having the turbine in the stock mounting location and still not have to add weight. Henke's words were running through my head when setting this thing up, wanted the turbine as far forward as I could get it.

Only thing left is the ebrakes. I found some with 2" wheels. This isn't going to effect the CG much, and will add a small amount of weight over the stock wheels. Both of the fields I fly at follow AMA rules, so we gotta have brakes!