Thanks for the replys, gentlemen. Good to have some confirmation.
Further research, and the purchase of a copy of TM 55-1520-209-10 helped clear up that on the CH-47A the forward opening of the two on the right rear is indeed the utility hydraulic cooler intake. The very aft one is... the apu intake.
The CB panels are vertical, thanks both of you.
And the upper cooling vents for the engines are wrong on all the kits out there.
Now to find a clear picture of the EARLY aft transmission drip tray, with a ramp light and TWO recesses, as opposed to the one recess currently installed.
Again, thanks for the help.