Also, how thick of sheeting are you guys using?
When aluminum .040 and sometimes .050 on roofs most of the prepainted
Sheets are also used in the racing industry so they are available most places
On roofs we almost always place a sheet of 1/4" plywood under the sheet
First attaching it the the frame which is normally 1" square aluminum tubing
1/8" wall . And sometimes 2" steel square tubing 3/16" wall when we want roll over protection
Some of the RV builders are also using the 3M VHB tape to attach there materials to the frames also as long as your frame material is clean it will adhear
Very well.
Keep us in the pictures ...........