You should X-brace the roof with some tubestock steel.
Then cut out your sections.
As far as the roof goes- no problem. I could cut it into sections and ship it to you. It is easier that way, and I don't think you need the whole thing.
Please send/post more detailed pics. People dig this stuff. It's very informative for everyone.
I do have done dents in the roof rails in some areas, but I will check, and post those images for you to see if it's worth your time.
Again, it's not bad.
Where are you located? I am in Southeastern Michigan.
PM me if you need to. Always glad to help.
Dan