RE: cheap meat locker???
plan to do this next year when i buy my hunting land i planed to build a building and put the same locker in it but 10 by 10 or so if you insulat it good look at handi foam it is a foam spray in insulation good stuff but not cheap but since your doing a small area not to bad you can do it yourself
get a window ac and it should work out find let us know how it works you might be able to get a refidirater kit for like a commercel size frezer that would keep it colder ortake one out of a big freezer