aircrewgunner

Ok, so im using 3dmax, and I have the model done. Im doing an SR-71, and im not too sure how to go about with the creating the aircraft.ini. Ive been through the knowledge forums, and i understand the engine and whatnot. but when it comes to positioning, size other things....do i I need to build an ini from scratch, or can i use specs for a different aircraft and make it work? Any help would be appreciated.