ok here is what i have done for just inder $200.00 bucks
a 5000 BTU gibson ac unit from Sutherlands
2 tubes of silicone calk
4ft length of angled aluminum
some phillips head self tapping stainless screws
and some sort of gel coated white wood i found in the book shelf section..
anyhow.. the Casita
now has A/C and we are taking it out this weekend..
PS i used the aluminum not only to support the unit, but it also help me achive the angle i needed for proper a/c drain
still have to do some finishing touches, but you get the idea and ill post up some better photos when im done.