Just remember that there are different rules for each state. And then each engineer has their own interpretation of those rules.
The rule about "chrome in the field of vision", it's hit us twice. We had to cover up shiney bits on both Cobra builds.
We also had to run a stock air filter.
Go figure...
There is only 1 rule when it comes to complying Cobra's: Do exactly what your engineer says to do.
Hey no one has mentioned the really important stuff like...seatbelt warning light that automatically lights up for 10 secs when ignition is turned on. Or I know, the labels that need to be stitched into the seat belts that warn occupants that the vehicle has not been crash tested. Or is this just a QLD thing.
At least we didn't have to put 3 wipers on the last Cobra to get it approved.
Be worth measuring the clearance that the old DRB fuel tanks had. They drop down fairly low. The only problem is, the rear body on a DRB doesn't seem to have as much droop as most other bodies, so it might have more clearance than you would expect.
Photo below is of a standard DRB fuel tank. On a long trip, with a highly polished tank, with the right light, it's a killer following one of these cars. After a few trips interstate, you quickly learned not to follow to close.