I dont think Mastercraft would release something like that. So if there is available files it likely did not come from them. Why dont you call them up and ask for dimensions or a complete diagram. I certain Mastercraft heres request like that all the time.
I did email them and that is where they directed me. I don't see why they wouldn't just give a surface drawing. It's not like anyone can do anything with that but maybe it's just not available. Oh well, no t a big deal... I was just seeing if anyone here already did the drawing. If not I can draw it up.