Creating R2-D2 in TSL

[Mu_Mu]

I want to replace T3-M4 with R2-D2. Obviously, it seems to me that it would be a little more complicated than a simple replacement of the model. What I need to know is:

- How to replace the model

- Do I need to rig new animations (or can I get away with no animations), and how to rig new animations (head spinning, third leg extending for walk/run animations)

- What files, .2da, .tpc, etc that I will need to change/access to make this happen

- What tools (programs) I'll need

 

I am new to modding and have had success with overhauling textures so far, but haven't dipped into modelling yet, however I am committed to making this happen. Any advice or directions into how this modelling stuff works is much appreciated.