Can't you adapt that rig to fit a 350D or 30D? I'm sure someone could work out a cobble.
That way you'd get 5150mm x 7.2 (XL1 adaptor) x 2 (extender) x 1.6 (crop factor) = 118,656mm. The field of view would be about 0.026 degrees, which is approximately 1/20th of the diameter of the moon. I expect you'd get something like this:
(Actually this was taken with a 70mm lens from lunar orbit by one of the Apollo 10 astronauts. I haven't done the maths exactly but I expect 70mm - on a Hasselblad, probably - from lunar orbit would be broadly comparable to 118,656 mm from earth.)
Trouble is, the lens would only be about f/200, so exposure times would have to be on the long side. I've seen good moon shots here with parameters like 1/500th at f/5.6 with ISO 400. So at f/200 you'd be looking at a 2 second exposure - heck, might as well go for ISO 100 to improve the IQ and expose for 8 seconds. Either way, you're going to need a driven mount so that the camera can track the moon accurately for the duration of the exposure. (The entire moon would pass across the field of view in about 6 seconds!!) Sadly I suspect that engineering a mount that could do the job with a 100kg lens would be non-trivial.
So what else could you use such a lens (118,000mm f/200) for?
Anything suggest it's a bit of a dull day in the office today?