Dale,
You've got a PM.
In the meantime...I've found photos of the parts I need to make / acquire....

So far I know I need tubing 33, 32, 72, 73 and 10. I would love to find brackets 20, 21, 22, 18, and 15...but I suspect that's going to be tough. I'm hoping that if I have the interior ducting I should be able to ball-park the positioning of the heater enough make my own brackets.
I managed to buy 79 and 80 off a guy in Saskatchewan...so I'm one step closer to heat.
Since it might help someone down the road, here's real photos of the bits that I found:

Front Bracket.

Side and rear brackets

Installed position.

Exhaust and combustion air intake. Not sure I understand why the big curve is needed on the combustion air intake. The exhaust pipe looks like it will be fun to fabricate...
-Dave