Their stage is 30 ft long, 12 ft deep and 9 ft from the ceiling. They had a bunch of 2×4’s lying around that they reused for this set. Then they bought four 4×8′ sheets of plastic poster board–not quite coroplast and it’s not quite poster board. Plastic poster board is strong enough to not tear and flexible enough to not crease. They cut each piece of the plastic poster board down to 16 in x 4 ft.
Their two center “towers” were 8 feet tall and the two outer towers are roughly 5 ft 3 in. To allow them to reuse the plastic sheets they velcroed them to the wooden frames. They built two wooden bases to place on each side of the stage, then set a truss up on each base. Then they hooked four trusses together and wedged them onto the standing trusses to get that rectangle boxed in feel.