Cutting a hole in the tunnel?

[Jriddle]

I cut through mine. I found that you will go through two sections per side. One will be three to four inches wide and will be filled with insulation then you will cut into the air return tunnel. I stayed above the Line Jack mentioned in his post. I added a picture with an arrow STAY ABOVE WHERE THE ARROW IS POINTING. I was worried about the structure of the bus by cutting these holes. I had a few more beers and went for it and have not seen any structural problems yet.

Good luck John

[mlh1936]

Good stuff, thanks much.
Mal