I relocated mine under the hood mounting it behind the right headlight. I made a bracket from 1/64 steelplate. It rests on a screw shank and is held in place by a nut n bolt behind the headlight bucket. You can see that screw in bob's pic.
I made the cables myself and used 0 AWG making the crimps with a hydraulic crimp tool from HF. I put the cable in loom and the ran shrink tube up about 18" from the end to protect everything. I am really pleased with the outcome.
This is exactly what I was planning on doing too. Making a bracket that mounts to an existing hole in the engine bay somewhere. Could you post pictures up?