Hi Linda,
We're a second year team with limited space and resources. We're working on a design using "engineered lumber". We're looking to build 2 sides for a AndyMark 1/2 field with two "I-beam Joists". Lumber yards sell 12" tall x 12' long joist. They weight about 30 lbs each (2.6 lb/ft) and should be easy to assemble/disassemble using hinges on the corner.
