I ended up installing mine behind the aft cabin wall next to the AC/Heater unit(shore power needed), exhaust running underneath the sink and out. Ran 2 ducts to the cabin and helm. It was a major project with how tight a space I was working in and making sure there were no excessive heat issues but got her done.
I actually just did mine. Best I could anyway, its difficult when its not on a trailer. Considering how bad it was, pretty happy with the result. Had never been waxed or polished in the entire time i've had it. So, 10 years or so.