I am going to be cutting a door into my TP body too, been doing alot of research on here and just reading everything I can before I tackle it. Alot of different opinions on where to cut it, hinges, latches, etc....I guess alot depends on you and what you want. My body is channeled so the the bottom of the door line is actually equal with the floor, so if I cut it on the outside of the contour line, I will have to reinforce the floor, not a big deal, but more work. If I cut on the inside of the contour line, smaller door, and will it look right? I am sure a few others will chime in and you will get all the confidence you will need to do it, post some pics when you start, I plan on posting some, and if you don't like fiberglass work or unsure about it, practice, practice, practice, use some wood and join some pieces together, it can be messy, but you will get the hang of it.