Otwell Manifold Heater?

[Russ Koch]

Hi Guys,
I am in the process of checking the fit of various heaters, I have an existing door in the firewall, & came across the Otwell exhaust being so low it lines up with the bend at the floor board AND the recess for the engine! I see it won't fit mine, but how can you possibly put a heater door in that will connect to it????
I think the Otwell is one of the best designs BUT? There is not enough room to flex to the flat area of the fire wall. I loaded some pics, but hard to see the fire wall. Are any of you using this manifold? How did you do it? If you have pics of the connection would be appreciated.
Thanks, Russ