Here is a outside picture of the 5000 BTU unit in our 1964 16-SC. I purchased the cover from Nichol's RV here in Dallas. It was designed for a Jayco Trailer. There are more pictures on my blog at txmcook.blogspot.com
I removed the stove vent in the wall and made a spot for the a/c.
Just so you know it came from Home Depot. There are 3 holes behind it and 2 of them have the 12 volt computer fans mounted to blow extra air into the a/c. There is a switched added above the a/c to turn them on and off.