Replacing A/C-Need feedback
while changing out the ac unit on my 71 27ft airstream I noticed that the ribs were about 6in away from where the ac unit actually . I do not know if that was the original design or not but I do not like the idea of the sitting just on the aluminum on top . Because I could not frame out the opening because wiring in the way I decided to put a bigger piece of sheet aluminum about 32in x 43in x 1/8 thick on top to distribute the weight. my question is how to attach it . I have a few ideas and I just wanted to get a little feedback . should I use self tapping sheet metal screws ?? or olympia rivets ? or aluminum screws ? feedback would be highly appreciated .