I know that some have put them in, but I can't find an example of one to help you out. I think it was a case of getting the prebuilt door and then the framing for it. Hopefully someone who has will see this. If not, search in here for things like battery box, propane locker, etc besides the ac. Good luck.
If so check my build out. I just framed it with 1"x1" square tubing like the windows. Earnest
Dadgum it! I cut that board 5 times and it's still too short! 2001 quad-cab Dodge Cummins 3/4 ton camper special, 16x7x7 CT work in progress toyhauler, 01 HD Ultra Classic, 98 HD Heritage Softail, 88 HD 1200 Sportster.viewtopic.php?f=42&t=51510