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I can confirm that replacing *.TPC with *.TGA without *.TXI works. I've got the impression that if you don't provide *.TXI the game will read that information from corresponding *.TPC. You can check it yourself with mods like this one. It has only *.tga files for saber blades, but *.txi instructions (blending additive and decal 1) are applied to them anyway.

The Ebon Hawk pretty much does what you are talking about. It swaps out the current skybox mesh based on what planet you are on. It's usually handled by globals (K_CURRENT_PLANET I think), but in the case of the landing on Lehon they use a separate module, so it's pretty simple. Looking at the regular (ebo_m12aa) Hawk's OnEnter, k_pebo_skybox, would be more informative. Or actually, since it is literally just #include "k_inc_stunt" void main() { ST_SetEbonHawkSkyBox(); } looking at ST_SetEbonHawkSkyBox in k_inc_stunt should give you a guideline to follow.

No, you can't dynamically change the LYT. What you could do though is animate the skybox change, which would let you do it all in the same module.

Why not use juhani's build as a starting point for the falleen one? If you looked at Savan (Xizor's niece) she had some similarity, though there were differences it is true: but you'd have the top knot, and the eyes as well, would just be a matter of the clothing too, course could always use a cathar as well if you wanted to add more diversity, or an ubese as well, they do have the models for that as well. https://vignette.wikia.nocookie.net/starwars/images/1/11/Savan_-_SWGTCG.jpg/revision/latest?cb=20131008210435