Are you certain mine is a HUM?
edit:
No need for an answer as I found this:
http://www.amv-lilliput.org/modelli/...8A_2/c8a_2.htm
(Translate from Italian using google or bablefish)
It does have the vents and exhaust port for the generator so no further confirmation needed. I did wonder at the excessive amount of wiring in the rear.
Well that makes this much more involved! Tracking down these items may be even more daunting than just CMP stuff!!
In any case to keep it simple I am taking your advice and focussing on those things that will get it mobile and safe then worry about the 'trinkets'. Excellent advice.