The BMR one is made somewhere else and is the only one I know of.
I have and am VERY happy with the Powerhouse alu 1-piece! I know CF should be as strong but I still feel better with alu going over gravel etc. TQ, strenght and weight wise they are compairable. I actually think the alu ones are a bit lighter than the CF one...!?
To make your own you have to know a great welderer. Plus balancing can get VERY pricey!
KJ, poorer but happier
Fox Lake Racing
Power House 411
Sun Coast Creations