May 9th, 2013, 16:21
It would help if you provide a screen shot of the aircraft in gmax with the Grid turned on (G).
For simplicity, place the aircraft at centerline, the wings at 25% MAC (1/4 back from leading edge of wing), and vertically at the CoG which should be about at the prop spinner. See attachments. Your Exterior/interior nodes/pivots must be set to 0,0,0 aligned with world.
In the cfg, you would have these statements to agree then with gmax location:
reference_datum_position = 0, 0, 0
empty_weight_CG_position = -0.0, 0, 0
Once you have the aircraft positioned correctly, use your x,y,z coordinates to get your cfg parameters. Just select a vertex in the tire tread for gear, lights, prop spinner, etc and convert them to decimal feet for the cfg.