Using parts from other aircraft, when modeling ?

I tried to find info on this, but is there a tutorial on how to use parts from other airplanes where I have the source codes files (GMax or FSDS tutorial) ?
Example:
Builidng an ultralight and wanting to use the panel design out of a Cessna (gauges and all).
Building a gyrocopter and wanting to use the rotor and blades from a Robinson R-22
Building a gyroplane and wanting to use the Rotax engine from a whatever ?
Example:
Builidng an ultralight and wanting to use the panel design out of a Cessna (gauges and all).
Building a gyrocopter and wanting to use the rotor and blades from a Robinson R-22
Building a gyroplane and wanting to use the Rotax engine from a whatever ?