i gave some thought to aluminum diff cases a while ago before i kindof got out of the hobby but they were far beyond my means. i wish i had been frequenting the forum more often so i could have been in on this. as far as bullet proofing your mt2, there is still the issue of hitting a curb and bending the center drive shaft which i have done on several occasions. take a look at my gallery and tell me what you think. its kindof ugly but it braces the chassis with out using the throttle servo as a structural member. PS, i would be interested in the drawings. i am going to college in the fall to do Mechanical engineering and i am planning on practically living in the machine shop. they have manual and CNC stuff so i would probably be able to make these myself. what would be a reasoable price for the drawings only? i wouldnt be in a position to get them immediately (no money and no cad/cam software) but by the end of the year i might be. thanks