Hey Nova, I tried to register just to reply to this, but had forgotten that I\'d already registered previously, so yeah, I\'ll post then =P In order to get rid of a visible seam across two objects that should fit smoothly, you need the vertex normals to 'think' that the other part is there even when it\'s not. I accomplished this in my Wings3D .msh plugin by allowing the user to designate geometry that wouldn\'t be exported--it would still affect the normals of the geometry that does get exported, but doesn\'t actually show up in the exported model. I have no idea how the KSP model format works, or what program you\'re using for modelling, but the basic idea would be that in your modelling program you model the full thing (not just the half), but then you only export the half without actually cutting the model. You probably only need one extra row of polygons, not the full other half, but it\'s probably easier to just have both halves. I explained the way to do it in Wings3D for my .msh exporter in my video (in the spoiler below--I couldn\'t figure out how to suppress the automatic youtube embedding) --that might help explain it.
Does that make sense?