Just finished putting this plane together friday night and the only major issue that I ran into is the CG of the airplane with a OS46FX is nose heavy just like the mark I version. What I did with the mark 1 was put the battery behind the Cockpit under the turtle deck. I made a battery box for it. With the Mark II version there is no turtledeck so there is no way to put the battery back there without cutting into that area and building a hatch or something. What I ended up doing was putting the batter under the above the servos and adding about 1/2 ounces of wieght at the tail area to correct the CG. Had it out yesterday but ran into a air leak in the fuel system that kept the engine from running right. Got the airplane up but the engine died and I recoverd it with no damage to teh airplane.
John