guys, you probably don't know, but bobbau already worked on how intersections are rendered, upgrading A LOT the z-buffer code, and we should worship him for the eternity for this (since in fs2 there were zbuffer errors even without intesectuions....)
Now even the most weird intersections are rendered PERFECTLY in game, and believe me on this since i already tested models with incredibly complex intersections.
The only problem that may occur when using intersections is related to collision detections, since intersections give problems when the pof compiler generate the BSP tree, wich is used for collisions, as for other things.
This mean that we CAN use intersections, in a very limited way, only when they are "clean" (like small objects that intersect bigger faces withouth passing through the hull), always testing the result.
There could be problems anyway with this model, since the ventral clippings of the middle section in this model usually show up when there are geometry problems