Danno,
I have a cheetah in mine and was able to balance it without any added weight. I have the batteries all the way up front and created a tray for the turbine battery that was listed here in the thread. It worked great. The turbine is as far forward as I could get it. The tailpipe comes all the back through the fiberglass tailcone to almost the end. About a 1/2" of the tailcone is exposed.
Let me know if a picture of the mount will help.
Gary