Re: vert rules
Convertible has to have at least a 5 point (the 5th being the door bar on the driver side) but you might as well do a 6 point. Since there is no hard top we have to put one in at 13.49. Once you put the cage in you also will need a 5 point harness rather than your 3 point seat belt.
If you do break out it depends upon the track. Most will let you run that day for test and tune, but sanctioned events will usually cause you to get pulled that day. The track I usually go to let a friend make multiple passes, and then the starter warned him he had to lift or he would be done. After making another 12.7 pass they told him he was done until he had the cage. But the next season when I was making 12.6 and 12.7 passes they let me keep going - more than likely because I am a regular there, and when I showed up this year with my 6 point they said "glad to see you have that, we were going to have to say something if you didn't have it this year".
Last year I made one pass at 13.2 at another track and when I lined up again the tech inspector came over and said "you can finish out today, but don't come back without the cage"
So you don't get banned for ever - just have to get the safety equipment.