[RedBarchetta]

I'm not an expert here, but I do recall seeing the Factory Five people recommend building a wood "bridge" that connects the front cowl to the rear half (just aft of where the seats go). That way you minimize the body flex front-to-back so that the middle section (at the doors) doesn't cave in. That's all I can help you with here, Tommy. Good luck...that's a big job!

-Deano