I set my thrust angle just as the book stated with the 4mm up and 4mm right with the motor also. I used the washers to get the thrust angle correct, and it flies true and straight.

Kevin pelletier - I have the motor box, and would be willing to part with it.

Edit: Here is a wing tube for CMP models. Im not sure if they are all the same though. http://www.nitroplanes.com/alwitu1.html