I am fortunate to have enough room in my back yard to build my own track. It is small but enough to race and jump catching sick air. Corrugated ABS drain pipe is cheap and as you all know works great for containment.
1/2" metal conduit opposed to spikes are much cheaper. 2' lengths driven through works great. I will soon send photos in as soon as I can figure out how to upload from my camera. The layout is simple but fun. Approximately
50' in each direction, hairpin turns with burms at each end and 2 medium turns forming an L. I used cheap fence panels from Home D. for about $1.50 each and 2x2 stakes for about as much, to make side boards to support dirt for a sick jump. If I really wanted I can adjust the gearing but good throttle/ brake control works and adds to the challange. Plus when I go to a bigger track I feel like I pulled the seat back in a cramped car. I can handle and control alot better than most other drivers. The lanes are wide enough for 3-4 trucks and really make for a great time. Driving in fields and parking lots are cool but this really rocks and adds challenge. I have had 3 different tracks in 3 different homes and actually chose the lot at my current home to accomodate a track. It's not the best size wise but for a quick burn when I yurn it more than does the job. I'e got maybe $100.00 invested and it's worth every penny.