QUOTE(Racer Chris @ Dec 13 2009, 07:47 AM)
Even though you aren't building for wheel-to-wheel racing, with a hillclimb car you still need to be concerned with potential intrusion from trees and big rocks. They don't present the same profile as the front end of a car does though, and I think a bar up high might be more important.
Elbow room and chassis stiffness are the next biggest factors in door bar design.
I would go with NASCAR style bars on the drivers side and x bars like you pictured on the passenger side.
I actually went with nascar bars on both sides on my Spec Miata because of the SCCA roll bar rules where if your bars interfere with the door inner contents then you can gut the doors. So, basically I did Nascar bars on the passenger side for weight savings.
Kyle
EDIT: Because I was W2W racing, I also walked around the paddock one day casually mearuring front bumper heights and that is how determined how high I wanted my Nascar door bars to be. Egress is important but not as important as my life