It sounds like your team might be looking at building a little taller, but I figured I'd share 3787's pit. It's quite easy to set up and compacts into a small trailer.
The back pegboard is now green and has hooks for commonly used tools.
The walls are wrapped black tarps with wood supports on the top and bottom to keep them from sagging and anything slipping under the wall from the other side. They adjust fairly easily to adapt to different pit sizes.
The desks at the front (we call them the reception desks) separate into the two sides, front, and three shelves each (The top one you see in the picture and two metal racks you don't see)
I'd be happy to answer any questions if you have them!

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FRC: 2015 Glacier Peak and Shorewood Event Quality Award, 2015 Shorewood Finalist, 3x 2015 Pit Safety Award and Hard Hat Pin Award
FTC: 2016/17 Interleague Winner, 2016 Interleague Think Award Winner, 2016/17 Interleague Control/Inspire Finalist
"You have to learn the rules of the game. And then you have to play better than anyone else."
Albert Einstein