Honestly, the bumper cars part isn't that big of a deal. If it gets left out, then that's not a problem.
Right now we're more interested in actually seeing if this map is possible, and if so, if anyone is interested in making it.
As efc mentioned with rocket jumping and bumper cars, it seems to work fine when they're in separate rooms. Take a look at Trade_Gamestylerz_SE.
We were hoping for the bumper cars area to be restricted to the car park 'room', I don't know if that helps?
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