I am not sure which Zenith this is then. The 801 is the high wing STOL
right?
This may be for the  ZODIAC XL/601. Somebody said all Zeniths were the same
firewall.
No problem changing it. Notice this is for a one rotor LSA. Are you using a
two rotor?

I dwgs are preliminary so I was planning on using that top center hard point
for the rear motor mount using a strut arrangement similar to this.

The rad may fit under the engine. Two rotors require a rad about 600 cubic
inches no more than 2 inches thick. That implies a rad core about 18" by 18"

Paul Lamar ...No rotor no motor.

Well, No I didn't say all Zeniths shared the same firewall, what I said was
that the CH-640, and the CH-801 Stol shared the same firewall (as well as
the certified AMD 2000). The only difference from 801 to 640 is the top
center reinforce present on the 801. The 640 being a low wing design doesn't
have this feature. I hope that I have cleared up the confusion.
I have no information on the 601 or 701. they may share the same firewall
design between each other, or not.

C. Smith
CH-640 builder

One needs a menu to keep track of all these numbers :)
What is the difference between a 701 and an 801?