Holy Cow!
Those whale tail bodies are as scarce as hen's teeth!
As far as I know, CMC was the only maker who made a whale tail. Honestly, the reason they're so scarce is that they weren't all that popular, but you can convert from whale tail to regular tail just by replacing the engine cover. If you like the look (kind of a 930 or 997 look) they're great, and I've only seen one up close, so it'll be a head-turner.
The body sub-frame came on all CMC's. Otherwise the body was too flimsy and needed the support. The body should fit on any torsion bar front end pan from 1954 to 1974. It will NOT fit on a 1971 - 1978 that had a MacPherson Strut front end. Your Ghia pan should fit, but this should be confirmed on here by someone who has actually done it - I've heard that they're the same as a sedan pan, but never confirmed it.
Things like windshield frames, windshield, exterior trim, interior (including seats, gauges, trim bits and such) are all readily available, but if you buy them new they'll be pricey. That will be off-set by the low price of the "kit". Expect to end up paying around $14K - $16K by the time you're done and on the road. Plenty of engine choices available - just search on here for the good builders and appropriate displacements and such.
Good luck, and welcome to the madness!!
Gordon
The Speedstah Guy from Grafton