
Select all the meshes in the Scene Explorer
Model ---> Poly Mesh ---> Merge
Tolerance 0, or it changes the polys to join the points
Merge Materilials, UVs
Delete Inputs
Save as SceneName_merged, so you can always go back to the org scene
As you can see, the engine is a separate mesh and not UVed proper yet anyway. Recluster the areas, reUV, then weld points to get rid of the blue lines. Blue indicates double edges and are not good at all for tangent mapping and lighting.
