Below are some of the ramblings and experimentation of 15 years of homebuilt and other types of exploration rebreather diving. I'm adding them newest to oldest, so bear with me. 

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KISS Sidewinder: Hoses under the arms and rigging options
Sidewinder: O2 Valve and Regulator
Rigging a REVO for dual oxygen and offboard diluent
Questions answered about building a BP60
Deathbox in action, Mexico- 200 feet and mixed gas! And some notes...
The first breaths of the "Deathbox" Biopak 30/60