Here's a photo of our new pit which we used for the first time at Waterloo
http://www.othsrobotics.ca/images/articles/pit2012.png
It replaces an ABS special we used for the past several years as the ABS was getting unsafe. The Bruce Power safety inspectors loved this one and it helped us win the Safety Award. It will shrink from the max 10' x 10' down to 8'-6" square in increments of 3". No ladder required for assembly. The telescoping tube is ham radio antenna tube and comes in increments of 1/8" with a 0.058" wall. I've been asked by several people to write up the design and make it available. One of my projects this week before the GTR West. I'll post it on CD as well.