i think there's been no interest because this sounds like a very strange type of race
not to discourage your creativity or say you can't utilize addons like that, but when i read "race" i expected something a bit more simplistic i suppose? those addons are also kinda outdated, especially the FROG
The FROG is outdated.  But its hilarious.  Giant ass alien vehicle...
That is why I ask for suggestions.  I have not been paying attention to the new vehicles that came out.
ia m intrested
Ok cool.  I will host this next sunday morning.  That day is my birthday, so I expect there will be a party or something irl in the afternoon.
Generally we would build a track in the first hour and a half, the race it the rest of the time.
potentially zone bricks with the names for checkpoints - or an output to do checkpoint[5] or similar
that way you can build a custom floating icon thing without raycasting
or just something on the ground/poles to go between
An output event sounds perfect. I want to separate races by name so that there can be multiple races in 1 build.  They would also be separated by brick ownership.  Cant have randos creating an extra set of checkpoints off to tge side and winning the race immediately.
So something like onventerzone > vehicle > checkpoint [racename] 
I can pipe the events into an extra script if we want to do something special, like change vehicles mid race.
I tested the server out on saturday.  I was able to make a ring that changes you from a car to a plane.  But the events are super complicated and it would be much easier to do with a script.
I tested a zone which makes it appear as though the vehicle was turned into a cannonball.  When the cannonball hits the ground the vehicle reappears.
I tested a pipe sort of track and tried to turn planes around in the pipe.  I did not have success with the corsair.  But some of the great war planes had limited success.
Proper collision is super nice.  I dropped a vehicle on the ground super hard and it 
didnt glitch through it.  It just sort of bounced. :D