My 68C Cabriolet's door is MUCH longer than that of a roadster. I have had no trouble getting in or out both before and after getting knee replacements. Hope this helps.
Went to lunch with my friend on its first run in his 35 3-winow street rod. It is a Ford in body only with chevy drive train and a 400hp + crate motor. Acceleration G forces snaps you back into the seat. NOT something I have to worry about with my 29 tudor!
I'm no giant but I'm stout... in a channeled Roadster... having the steering wheel close to the dash gives room for the belly but would hinder the leg action for the brakes and clutch.
I used a pair of stripped down office chairs sitting flat on the floor and it turned out to be the most comfortable set up I've ever had in a Roadster!
Plenty of room to get in and out as well as allowing me plenty of legroom.
I' let a giant of a friend 6' 4" 300 lbs drive my car and after he squeezed himself in there he was very comfortable behind the wheel... but it was a different story getting him out!
The first shot is in the rough and the next was with bomber seats which offered more room but less comfort.