I am just starting a air hose type form.I purchased some 3/4" cabinet grade plywood that is about .25" of an inch shy of 1-1/2" inches doubled up. I found a piece of 5mm plywood bought it and it makes my total about a 1/8" over. If guys would please give me your opionin. I dont have a drum sander .I do have a 6" x 48" that made into a side sander.I was interested to see if that was enough to worry about. What would you guys do?