Hi DementedSun,
I have taken a look at your model file and quickly looked at the UVs they were very large i have shrunk them down, unfortunately i wasn't sure of how the model looked originally.
I also have looked at your collision issues.
The problem there is that there are some faces on top of each other with the normals facing different ways, this causes an issue in Banjo Kazooie, as BB will generate collision triangles for all faces unless you set them to not solid.
I deleted them and loaded it into the game to test it seems fine. I didn't have any of the other problems you had.
Here is the download for the obj and bins let me know if there are still problems or you want me to go over anything with you on it.
I know some of you will be on here and not RWC it does make things easier for us if these problems are posted there. But thats fine CBM will be able to help you on here with any problems you guys have.
Download:
http://rarewarecentral.com/files/dementedsun.zip