I'm also 6'5" and in the process of re-vamping a cobra. Engine is sorted, I have the paint selected and the right folk to do the job (both mechanical and cosmetic) but the one loose end is the trim.
Sorry for the Hijack

but I would really appreciate if anyone could post (or pm me) pictures of the "no seat option" I've been reading about. Specifically the method of building the seat or trimming cussions directly onto the floor and the rear of the cockpit.
My cobra has a raised section which the seat currently bolts to. I can drive it, but not comfortably for extended drives as I have to shuffle forward in the seat so essentialy the only part of my body that comes into contact with the seat is my shoulder blades and my tail bone! Im the only one that drives it and it is fully registered so this trimming option sounds like it could be a good alternative for me.
Thanks.