You will get your best answers on rc groups in the large jet forum if you start a new thread. But I will give you my 2c. Build the model first with all gear and paint. Well maybe you can skip the paint but build the model with servos and retracts. Then place all your equipment in the model until you reach your ideal cg. That means fans, batteries and esc. You will need to move them around until you make cg. Putting your fan in an ideal spot does no good if you have to add a lb of lead in the nose.
Last edited by MarkF; 02-19-2021 at 03:39 PM.