Well, I learned what to do for cutting holes in exterior structure.

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Since I'm using 3D Studio Max 9, I just need to know how to apply the sub texture in order to cut the holes shapes and give them the good inclination.
Alternatively, I could use a schematic to use in 3DS.
I know there is modders here which works with 3D models. Could someone point me to a good S-18 Schematic?