I'm sorry I've only just started moddding RTW, but in the absence of some of the gods answering, I'll try to answer your questions.
1.Units are 3-d models but with a "skin applied" . The 3-d unit is a CAS file which requires Max to edit. You can edit the skins however in 2-d.(these are tga.dds files) This is described elsewhere on the forum. To change a head shape would require the 3-d model change, to change its appearance(skin) is much easier.
2.I believe you can change weapons etc in the txt files , again look in this forum
3.This also requires editing of the txt files only .
I thnk all your answers are available here in the modding forums.
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