The CAV is now available in a spyder version. It sort of looks like a targa roof when removed. Concerning the interior space. The GT40 demonstrator that I am finishing up (see
www.2gmotorsports.com) has plenty of room. I am 6'1" and when seated have 2.5" to 3" of head clearance and my legs are fully extended to reach the pedals.
Thanks
Gary