I think on some cars you could "unibody" it in pretty easy. on my fairlane (I think classics mustangs are this way too) the inside of the rockers are nice flat and vertical. But I have the added bonus over them of subframe mounted trans x-member BEEFY torque boxes (talking like .090" plate) and a reall beefy front clip.
I could see this full frame really cutting into rear footwell area and the work for body mounts would prob be more than doing a unibody install. plus with a unibody install I think you would have a REAL stiff structure that would be lighter than a frame/body setup (IE no mounts to flex, no extra metal for mounts) if you had a chassis tailored for the specific car/body that could just be rolled under a gutted shell and once lined up welded in place would be easier. heck even have a couple cheap locating brackets to bolt it in place for welding.
I think the more you add to a unibody to strengthen it the better. could those outer frame rails be made not as wide so when tucked up next to and welded to a stock rocker it forms a beefy component? plus it seems with most of the hardtop cars you are just gonna be plauged with flex anyways.
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