yes, I have read on this site and the Skoolie Conversion Facebook page that some folks have used the pre cut sheets of metal (HD, lowes, or tractor supply) and rivoted them in...but like you said, that is a lot of holes! I have also been reading people recommend polyurethane caulk..i just don't know if I should go with the window one or the concrete one...I have read polyurethane is the best thing to fill in holes 1" or less...sometimes a little over an inch and it is ok. I will let you know how it goes if we go that route
