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My internals are completely different. In the original Thor 15mcp, the white skeleton/frame represents the unused space in the cavity. Approximately 3" in depth.
It's hard to tell from a 2 dimensional photo. But from your photos of the inside of your unit, it looks like Cyclops eliminated most of the unused cavity space.
Pic 1:
Automotive HID mounting bracket
Pic 2:
With Ballast installed into the mounting bracket
My ballast is sitting at a 45 degree angle. Your Thor looks like the ballast will have to be laid flat. Probably with some extra strength velcro.
I would suggest that you calculate how deep the reflector is sitting in the housing. I would guesstimate that you'll need a minimum of 2.5"; for the ballast to lay flat with some space for the wiring at the rear of the bulb.
I'll take some measurements of my ballast tomorrow.