Hi guys,
Id still be concerned with the main straight aiming for the pits, something should be put in place at the end of the straight that forces cars to slow down without sending them flying if they don't.. I have seen cars also not try and turn and go straight into the roof going the other way. And i have sent a touring car 2 meters high in to the air from just clipping an apex at half the speed of the brccc straight, maybe a tight net would be useful as a barrier too going up to the roof? (if you want to run anti clockwise)..
I agree that its an off road track so as many different challenges should be layed down as possible, new surfaces would be a good idea like astroturf or other but I think jumps could be uses better if there was more of them still, like multiple with down slopes so you have to land the buggy on a downward slope to go faster? Kind of like how your table top is now, but more
Rumble strips sound good, how about trying some of this stuff too?
http://www.ebay.co.uk/bhp/corrugated-roof-sheets
andy