I'm not being negative. Only pointing out that something designed to afford protection to the driver and passenger should do just that. I admire Phil's dedication to producing parts for the Haynes Roadster.
A roll bar should be high enough to be above a helmeted head. Draw a line from the top of the front of the chassis to the top of the roll bar. If your head is a reasonable distance below this then that is fine.
The roll bar needs to be braced diagonally to prevent it from folding sideways.
The roll bar needs to be braced rearwards to prevent it folding front to back (These braces don't have to be straight. They can be bent to pick up the chassis at suitable point).
If you do that then the MSA approve it.
Any more parts aren't strictly necessary. If there are more parts fitted they need to be done in in the same way.
I am not suggesting this is easy to do, especially with a completed car. As an example MK's roll cage doesn't meet MSA regs due to the double bend in the front leg.
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