Mike,
You can build a "DIR" style sidemount harness. I did it (as have several others). Its extremely simple- you attache the webbing directly to the wing via grommets and bolts. You put a D ring on each side of the waist strap to facilitate attaching bottles, and use some peices of shockcord to help stabilize the bottles. Lights, etx go in the same place as always (this works best with the smaller canister like the Helios 9). You can also scooter and carry stages.
You can build a "DIR" style sidemount harness. I did it (as have several others). Its extremely simple- you attache the webbing directly to the wing via grommets and bolts. You put a D ring on each side of the waist strap to facilitate attaching bottles, and use some peices of shockcord to help stabilize the bottles. Lights, etx go in the same place as always (this works best with the smaller canister like the Helios 9). You can also scooter and carry stages.