I'm a little new to the whole F1k game, and come from an FV background. I'll ask a stupid question -- Why do you need to allow the additional expense and complexity of tunnels? I beleive that these are illegal in FC? I see no real advantage to allowing them in F1k. As far as weight goes, 900-950 with the driver should be no problem, even for those wanting to use an older SV (Lola type) chassis.