Originally Posted by queadlunnrau
...Or u can mount it inside the hatch were u put a lipo, than anything goes if u don't put a large lipo in....
I believe the battery mounts in the cut-out under the wing. Although I think I see what you are saying. The specs are not too accurate and only call for a 1000mah lipo, so it would need to be mounted likely well in front of the existing battery cut-out under the wing.
The specs also say the AUW (including battery) is only 570g (20 oz) which is basically the weight of the plane WITHOUT the battery. If you use 450 or 480 size motor and a 1500-1800 lipo then things should balance out nicely with the battery in the cut-out under the wing and the ESC in the "pocket"...I suppose you can put the receiver where ever you are comfortable with it.
When properly setup, this plane flies really well! Hard to beat the Katana's ability to perform...especially at the price they are being sold for!