I found out the hard way that it is far better to build the cage "by the book" the first time than it is to replace bars after the fact. Note also that some of the sanctioning bodies have upcoming rule changes (2011) that mandate two (vice one) doorbar. I also spent a lot of time moving my battery cut-off switch and adding an aluminum firewall between the fuel cell and passenger compartment of my plastic car to conform to rule changes. Another hint is that the sooner you get your car certified by one (any) sanctioning body, the sooner it is "grandfathered" for future rule changes, and you can usually race in other series with an SCCA or NASA certification.
Pappy
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