not hatting on you, but do you think carbon fiber motor mounts are a good idea? im not a official engineer but i was doing structural and materials engineering before i decided to drop out of college. heres why i think its a bad idea.

carbon fiber will be stong only when load is applied parallel/same direction as the carbon weave. side to side, i feel as if the carbon will flex and eventually crack from viibrations. its not my bike im just trying to keep you from wrenching and get you riding. i know a guy on the bansheehq who can lazer cut any metal for u, if i were you, in a perfect world, id use titanium. in the real world id say the same thickness stainless would be the best material.

heres me speaking outloud here. in my experience with materials sometimes "strongness" dosnt directly relate to stiffness. sorta like bullet proof vest, instead of the bullet being stopped by a super dense hard metal we use a light weight, flexable material to slow the speed of the bullet.

i see carbon as just like a kevlar vest, it gains its strength from being flexible. you can bend a sheet a .25 carbon fiber plate more than double than a .25 steel plate without compromising the integrity. given carbon fiber is lighter, theoretical stronger its properties would not make an ideal candidate to isolate and supportthe motor under full load.

ive never worked with carbon before so dont take anything as i say as fact. but i still feel as if stainless is the best bet.
you already broke 2 aluminium brackets without riding it