Ok guys. I'm sorry for the delay in getting back to you on some of the rules clarifications. As I said before, Czar is advising on the technical aspects since I'm too much of a novice to know most of them. He is still unavailable but I got a message from him after he had read the thread recently.
As far as guide depth, its okay to trim them, but we suggest not to do so any more than necessary, especially since it doesn't seem like any of the tracks require them to be trimmed.
As for these questions:
"would be "ok" to use spacers/washers/etc to limit side to side axle play?"
and
"Is there a minimum ground clearance requirement? And if so - is it acceptable to "remove" material from the bottom of the chassis?"
We decided that this is beyond what a beginner might understand and might make things more complicated. So let's not allow either of these changes.
Rico - Deadline for entries to arrive is July 15. We haven't given addresses or set the order of tracks yet because we were waiting as long as possible to see what questions may arise as far as rules go and to see if there are any more tracks to run the race on.
Thank you all for your patience.