I was the guy who made those
Scamp AC window brackets.
-Yes, just a very standard small window AC and they are standard dimensions.
-Build exactly to plans, exactly! It's a very tight fit, it worked great.
-It must be taken out for travel but was sturdy enough and well balanced to hang without a support.
-Yes, Scamps are wired with 12-2 wire throughout so you can plug an AC safely inside to my knowledge.
-Yes, down the road I would go rooftop with a
Scamp. Very easy to see if support was already in, just rub the roof and feel for the already existing 12-2 wire that was put in at factory for future AC.
-No, I am not making any more AC window supports anymore. I made a few for others but you have to get full sheets of plywood or plastic and the dimensions needed are not very efficient with a lot of waste. You may find somebody who has the right pieces lying around from other projects for one or two. But making more from scratch you have to make many to make it worthwhile in my opinion.