I've always loved the 65 and up Corvair styling, more than a little intrigued by the mid-engine conversions.
A few questions I've always wondered about:
What sort of differential/ or transaxle did you use?
Since the Corvair is a unibody construction, do you notice much body-flex after cutting away so much of the floor pan? What sort of bracing was needed to compensate?
I'm assuming you are going to eventually enclose the engine bay to separate it from the interior, but are you going to fabricate inner fenders for the rear wheels?
How are you cooling the radiator? Most conversions I've seen, usually wind up cutting vents above the front bumper. I couldn't tell from your video, but it looked as though you may have had a grill between the spoiler and the bumper. Was that enough, or are you using electric cooling fans as well?
Is there anyway to add AC if so desired?
Sorry for all the questions, but like I said, I've always found this mod interesting.

There is a gentlemen who lives close to me who has a beautiful yellow Corvair roadster. It looks stock except for a fabulous custom interior. He took a totalled Honda Civic SI , (I think) and installed the complete drivetrain. It now has Front wheel drive. The next time I see him at a cruise in, I'll try to get some photos. Of course it's nothing like a mid-engine conversion, but was still quite a mod, that's for sure.
Thanks for posting the video.