Nice job David! You are welcome, just having fun. I have been interested in this model for some time. Here is from the manual
Note : balance the model with the gear down and the tanks empty.
The center of gravity (CG) must be located at 130mm rear of the wing leading edge (wing root)
You must check it before the first flight, to do this with the aircraft in flight condition but without fuel
lift the aircraft in this point, the aircraft must adopt a slightly nose down attitude. If it is horizontal or
the tail drops move the baterie forward or add weight in the nose.
In other hand if the nose drops considerably add weight in the tail.
David if you could, please give me approximate measurements of the fuel tank, and also if you have a scale or one you could use, the AUW with fuel in the UAT would be apreciated. What engine are you using?
Joe