Guidelines for building tape delimited MTB courses There are a few vacant lots around where I live and last weekend, I built a small (170m) tape delimited course.

Some of the kids in the neighborhood rode in it. I also worked out in it, going full tilt for 30 minutes (ie. 36 laps in 30min, 6.2km). Some portions were up a grade, others went down a grade. There were a few areas that were quite tight to turn around in, but otherwise, it seemed alright. This lead me to search for possible standards in this area.

I was wondering if there were guidelines or standards for building such courses in terms of lane width, turning areas and such? 

Edit #1

Here's what our course looked like:



The corner in this image was quite hard for everyone - which could just be testament for our skill level :)

The goal isn't to be a UCI event, just looking to give my kids some more experience riding.
Yes. Have a look at UCI's MTB rules at http://www.uci.ch/mm/Document/News/Rulesandregulation/16/72/76/MTBReglementsENG_English.pdf

Look for "course marking".