Great advice here I am in The process of getting my Township Recreation Dept. interested in Building a Track with the involvement of The local PD involved as a youth program and a Councilman and Hobby shops as Sponsors.
As for some tips, I have seen is using Pool Noodles as bumpers around obstacles Amazon has the traffic cones of many sizes for RC tracks. Very Cheap. The surfaces are one thing from dirt. Blue Stone dust sand we R talking about, It has to be pretty much maintenance free but for the racing surface. But most importantly have to gain interest in it to make it a worthwhile project. keep the Ideas and suggestions coming