Next I really battled with did I want to cut these 1 1/2" holes now before the conical bend? I want to get that conical bend over with, however for the life of me, I just couldn't figure a way to cut the hole cleanly/easily after the skin was bent. Decision made....Ill cut first, bend later. Fingers crossed.
I drilled the pilot hole up to 1/4" then used a 1 1/2" hole saw on the drill (in reverse). Makes for a much cleaner cut and doesn't want to grab and mar the aluminum.
Seeing that I was going to work well...I de-vinyled before I continued drilling.
I managed to get both sides done and re-cleco'd the side skins back on.