@WOLFGANG said- "So that's a real unibody 356. The 2 side longitudinal heat channels look to be worse off than the pan..."
You are right, Greg; that car needs a little work! Wonder what that will cost...
(but then, that's what you get for needing a "real" 356!)
@Todd M- aircooled Beetle convertibles, while using the same pan as sedans, have extra longitudinal bracing on the bottom of the body as well as extra bracing throughout the car to keep them from flexing.
"I was probably mistaken, but somehow I thought that there were some replicas produced that did not have frames and the doors would open or close when lifted by a jack."
I'm pretty sure all Speedster replicas have some sort of steel sub-frame (as I think someone already mentioned). I have an early Intermeccanica (one of Frank Reisner's 600 or so that he and his partner built in Los Angeles in the late '70's before moving to Vancouver) and the sub-frame is glassed to the body. Some CMC cars (and maybe others) do have what some on here call "butt sag" and need additional bracing to the rear of the frame so the doors keep opening properly (and the car from flexing), but all IM's (and Beck's, I believe) have it already welded in. Al