morning,
when it comes to seat position tall drivers like me (6,4") tend to adapt quite easily in sliding forward in the seat - at the cost of our back and spine...
In fact in my daily driver a valet who is about 5.8" doesn't even move the seat to park the car.
However, with the leg support used on your seats I would not be able to slide forward with my bum.
There are seat runners available in England
http://www.europaspares.com/
look for seat runner or directly
https://secure.visav.co.uk/avshop/products.asp
about 25mm high, that can be cleverly recessed in the seat, like I saw on CAV/Carcraft new GT40 seats.
Adjusting pedals is a possibility, but quite a headache. I saw various at Lotus Super 7 replicas. You may find them at Nascar or other racing cars as well.
Transmission crossmember:
Do you think your your chassis is not tending to flex too much with your tiny trans cm?
You may add another between that one and the rear. Just a thought.
For the removable CSX4000 trans crossmember Shelby SA went to great lenghts to keep it reinforcing the chassis.
all the best for 2007,
dominik