As I recall your plan is to finish the outer shell and then turn to the suspension, with possibly Honda Civic components. Isn't that right?
I've been enjoying Julian Edgars' articles on Autospeed and I was really interested by this one:
One Very Stiff Body!
The Austin 1800 had independent trailing rocker arms in back, and rocker arms instead of McPherson struts in the front. This directs the suspension loads into each other and unstresses the body itself. Neat.
That fore-and-aft strut is where you get the anti-roll. Think you could use this?