1976 k5 roof chop?

[chops76k5]

i have a 1976 k5 and really wanted to convert it to a full convertable but its too much of a hassle without any donor vehicles. i was considering cutting out a section in the middle of the roof about 4" in from the edges of the roof along the doors and the windshield and modifing my soft top to fit for the opening. the only concern that i have is that, will i lose structural support in that area? will the sides want to pull into the middle of the truck? is there a way to support this area? thanks