I might be able to do some of these models, what file format and poly count are you after?
MD2 (used by the game) and .obj are the perfectly fine.
Blender3D (and 3DsMax) files are welcome if you want to provide the source files as well.
Image format should either be
jpeg or
tga for use with the finished models and/or
Gimp or Photoshop files if you want to provide the source files (e.g. if you used seperate layers for somethings)
PNGs are also fine if you just want the textures to be avaliable without comrpession-loss.
The texture dimensions have been mentioned above, but if you make them bigger it's not really a problem, but don't waste time and effort making them high-res, because for ingame use they will be scaled down.
How do I access the SVN repository?
If you mean read-acces, i think you can use the web-base access to the
model directory or see
here and
here for instructions to cheout the svn repository (pretty big).
I doubt that you will need write access for the svn rep unless you want to add a lot of stuff to the game
... then just contact mattn.
Werner