Given the stop light viewing problem, I wonder if the stop light viewer accessory they used for Fulton visor installs would help? They mounted on the dash and used a glass prism to reflect the lights. I've seen these occassionally on cars at some shows and off and on eBay.
As for the seats, I would think modifying the pedestal would be needed which would also require moving the gas tank and related. Given that, it would seem the options expand, as do the challenges. Several of my street rod buddies have gone through this effort several times each to get the ergonomics puzzle solved to their liking.
