I'm new to the forum and Model T's in general so I thought I'd throw this question out there for your consideration. I recently bought a '26 roadster as a project. For some reason the previous owner cut the subframe that holds the turtle deck. Possibly it was rotted away and this a donor subframe since it does not appear to be a perfect fit. I can weld pretty well so I'm mostly interested in your ideas about how to insure alignment etc. Has anyone done this and what might the pit falls be?? critical measurements, etc.??
I am out of my normal element, but logic says that if it were my problem I would find a copy of an original Model T frame drawing and identify the frame holes that interface with the entire body. First making sure your frame was straight I would mount the front and rear parts of your two piece body and bolt it down with all the appropriate wood blocks. Then carefully mate the two parts with good body shop welding/finishing practices.
Ron the Coilman