Just thought I'd add a couple P1 chassis shots for those who may have not seen one.
Pic of a basically stock P1(I have added a different rear end). Note the shims that can just be seen holding the motor mags in place. My biggest peeve with the P1 was the motor mags dropping. This used to get run alot...but is currently seeing less and less track time.

This is a pic of the P1 with polymer mags and silver electrical. The problem of the magnets dropping disappeared when using these mags (and performance increased significantly). This gets run at least once a month to keep the cob webs off it