I had two of those planes. The first one I damaged when my moki 2.10 quit in a
hover. Thes second one I sold to finance another project. This plane is very good
for 3D and IMAC. Harriers are very stable. The key to good 3D though is to keep
the wing loading down. If you use a heavy engine, then the wind loading might
end up too high for good 3D. Mine balanced fine with a moki 2.10. You won't need
any nose weight with the G45. If anything you might need tail weight. Good luck.

Greg