Got a buddy in another state that praises his RockSteel Sheet Metal Nibbler.
watched some videos about it, it can get some pretty tight profiles, and rounds the edges!
So, instead of drilling, grinding, and/or chiseling a billion rivets from the ceiling skins...
Why couldn't a person just nibble each side of the ribs and call it good? Heck, the ribs are staying anyway....
Get an Air Drill, a RockSteel, crank up your Air Supply(yeah, I see it
), and just nibble away.