So this was a busy weekend doing my first camper mod. After reading for weeks about all the different ways to install a window air conditioner in a camper, I decided to go the in-cabinet route. Here are some pics. I've built Styrofoam channels for the outside air to circulate properly, as well as added an exhaust fan to ensure all the hot air escapes efficiently. Lastly, I installed an angled Styrofoam piece under the unit, to direct any condensation out the vent outside. I'm pretty proud of getting it to turn out decent, especially since I'm not really a carpenter or anything.