Floor Replacement

Long story, short, I have a 2008 Dutchman Tundra needing a portion of the floor replaced. I am doing the replacement myself but wondered if anyone knows where to find spec or build sheet resources before I dive into the project. I called Dutchman and they would not provide any of this information to me as an individual. I'm trying to limit surprises as much as possible. Any advice or assistance is appreciated.