I have yet to see any build sheets, but I have heard of people mention they had one, but they don't share. I'm thinking you can visit the Library on this site and browse the workshop and chassis manuals for information you are looking for. Lots to see and read, might take a while.
If found, they are usually found under the back seat. They can be located other places like over the fuel tank. In most cases there is not much left of them.