I think the best way to exchange (unanimated - Animated stuff is more tricky) 3D files is to use the
.obj (Wavefront) format.
You don't need to bother with the md2-export, we can do that for you once the models are accepted for the project.
If you have any troubles with models just PM me.
Since I do not know AC3D I can only guess what happened in your md2 export, but that the exported md2 files are untextured might not be a problem at all. I think the textures might just not be loaded (i.e. The UV map is ok but not used with an image).
Also the md2 format does not support polygons with more than 3 vertices/edges (i.e. tris only) - this might be your "messed up" geometry, the exporter will most likely triangulated the mesh.
Concerning the quality of the model and texture I think that'll have to be checked by Winter. I suggest to post images of your models here and prepare to get critics
Cheers,
Werner