I have my custom model processor but I am having problems on adding it to my solution. I have it "added" in the solution so now it says "Solution 'Collision Test' (2 projects)". I then added the .dll to the references of my game. So I tried running the game and it still uses the default model processor. I obviously am doing something wrong or not doing enough.

1. Reference the processor project from the References tab of your game Content project (not the main Game References folder: the one inside the Content subfolder)
2. Select this new processor in the properties for each asset that you want to use it (in the Visual Studio properties pane)

Shawn Hargreaves:

Select this new processor in the properties for each asset that you want to use it (in the Visual Studio properties pane)