Looking at those pics of the interior stripped out, it occurs to me that the handbrake mounting boss might be able to be moved forward enough to put it in front of the passenger seat?
If you are going to lower your floor pans, my recommendation would be to put in power seats. You can tie that in with Corvette seats using a 'vette power seat platform.
I built in a Honda Civic adjustable height devise for the steering column and pushed the steering wheel as far forward as the directional switch operation would allow.
I also moved the pedals forward 1-1/2".
One thing that I did find is that you need to retain the original throttle pedal because of the strange twist they put in it. Current replacement pedals that don't have that twist will not work.
Also the adjustable column in this car is a bit redundant once you put the wheel where you want it, unless there are going to be multiple drivers. The pedals may also be too far forward for shorter people.