I've had this in mind for years, I've looked into the rigidity concern and am honestly clueless.
I have a composites shop at my disposal and a few years composites experience, and a good friend who can industrial sow the canvas.
I plan to take the leap next year, maybe this year if there's enough interest.
My 100 is a rust bucket, it'll never be what I want it to be, which makes it a great donor in my opinion. Once its done I'd gladly have you guys come flex it and share your feedback.
I'm curious to know, I've heard some of you say you want to be able to stand back there, obviously a bed platform.
So ideally a triangle shape is what is desired? It'll result in the most height gain, I'm still doubtful a tall person would be able to stand back straight. The higher you go the more irritating the wind and weather will be. I'm 6'4 and I can barely lay on the roof of my 100.
Would you guys be more inclined to a DIY kit or installations?
I've thought about mounting options and that likely leaving the roof rack gutters a good place to frame off and attach to, with riveting brackets near front and back if necessary.
The triangle shape or flat raised is the biggest concern for shaping the top that goes on, my 100 has SRS airbags that I intend on leaving in as well.
See one of my comments for a quick 3d mock up I did for the full roof pop, I like that shape and it would allow for a roof rack if power raising was implemented at a later date(actuators).
Edit:
Editing in the 3d photo, looking at it, the x braces will work better without actuators, and would be more centered.
Also for the rigidity concern maybe some eye and eye turnbuckles attached to brackets riveted on the roof would be helpful(across the opening), could be taken off for camp.