So, in less than 7 days, Bob has poped up the specular maps, the FOV and the clipping free modifications. Plus I've heard about the -trans tag for the maps. I needed to test it:

( edited, damn case sensitive thinguy

)
That's my upgraded valk pof ( as usual thrusters don't show, it doesn't have lods or debris, etc etc, but it works ).
The thing uses everything the narmal FS2 exe would hate:
many subobjects ( way more than 1000 polys ), intersecting polys, etc etc etc.
-The clipping is near flawless ( can barely see a poly through the front of the cockpit ), I think that's definitively out of the way, great job Bob ( clipping test area: the cockpit, and the litthe dents bording the recessed areas ).
-the specular map: as cool as it looks, it has a big pb: it seems to work on a poly basis, and it shows on every model I've tried: the polys shows ( look at the "hole" on the midle of the ship, you can see all the polys that are around it, for exemple ). I think it should use the smoothing groups.
-the trans tag: makes the thing invisible

the windows of the cockpit ARE modelled, but they won't show at all. I've tried a grey and a white map, same result. I tought it might be like the glow map, so I duplicated the map, but w/o the -trans tag, it results in no transparency at all ( white painted windows

). maybe I didn't understand how it works, tho.
-FOV: haven't tried yet, plus can do that with anything