I agree, this project, the D2 and the Romulan cruiser that I was playing with could likely all benefit from re-mapping. I have, however, thus far only been able to paint a few pretty pictures. This one's particularly interesting because the light maps existed before I started. I intend to look at the Material editor in G-Max and see if there are any differences in the settings between the ones that show and those that don't.
Otherwise, the underside is stuck about as shown. There is a little overlap on the edgs of the wings, but it's not too obvious.