What I did with mine is to move the fuel tank back to the cg ( if you look you will see a secondary place to mount the fuel tank behind the first bulk head not shown in the instruction manual) then I went to dollar store and got a metal playing card box and used that to melt lead in it it gave a nice flat bottom after I pulled the tin way from the lead and the I used it to adjust it to get the C.G. then I glued it in the tank compartment. The engine I am using is an MT35 and the ignition and battery in the fuel compartment. Don't worry about the weight the big wing wont know it there. The giant stik takes a lot of weight in the nose at least the two I've built Michael