I made a hatch that fits into the first open section on the bottom of the fuse and put all the servos and battery behind the wing. I also used 2 elevator servos. With everything moved back several inches it balanced just fine with no lead, I just move the battery back and forth. The nice thing about the YS was being able to slide the tank back close to the CG. The 140 would not be too much weight and a lot of fun with all that power.