Here is team 45's pit from 2006.
This thing folds up into a rolling structure that is about 4 ft. wide x 10 ft. long x 5 ft. tall. It takes about 5 minutes to set up. We bring it to the events with our trailer, along with a large tool box and totes.
When set up, it is just under 10 feet tall.
The material we used to create this is
Creform, which are thin-walled steel pipes with plastic coating. Creform has fastening hardware, tubes, and accessories available to do much more than what we have done.
One regret in making this canopy is that it is too wide when folded up. It really needed to be within 32 inches wide so it can fit through a door.
Looking at
McMaster-Carr, I see that they classify this stuff as "Steel Clamp-On Structural Framing System".
If you are designing something similar to this, plan for it to be no bigger than 9.5 feet x 9.5 feet x 9.5 feet.
Andy B.