I'm trying to come up with a floorplan myself. I think I will be going with the 6x12 with a V-nose. While poking around I have seen a couple AC mounts on false walls, This one is one that I like
gallery/image_page.php?album_id=21&image_id=96960 since it mounts in the E-track and can be removed depending on season.
Are you thinking Ramp door or Barn door? I've got an idea floating around in my head that I think will work, I can't imagine I'm the first to come up with it based on the level of inventiveness that I've seen in the build photos. What I envision is using the barn doors to mount the galley in such a way that the galley can be used inside the CT with them closed in nasty weather. Weather permitting, you could then open the barn doors 90 degrees. With the doors open to 90, the galley is now exposed outside, and a wall that was the SIDES of the galley when inside now form a BACK wall to the galley, closing off the inside of the CT from the outside. This wall could have the AC unit mounted - say under the counter. When opened, it would vent heat and condensate outside and cold air inside. When closed it would be mostly out of the way under the counter. When not needed for winter camping, it could be removed and the hole covered or possibly replaced with a heater unit.
With some careful design and construction, the doors could continue opening to 180 and on to whatever maximum they have. This would split the galley into 2 halves, which might allow for more "cooks in the kitchen" or more hands to help with washing dishes and general cleanup. The "Wet" side might even allow for use as a shower. When open this far you would loose the ability to air condition, but now have full width access to the back of the trailer for loading and unloading gear, toys and people.
WoodSmith