tube end cap 480 can be a soffit bracket 494 fastened with two bolts 482 structure anchor connectors 483 can be attached to ceiling tube end cap 480 via bolts 482 as shown in fig7 b on a minimum of two adjacent ceiling tube assemblies 400 a lift handle 402 can be attached via a lift handle bolt 404 inserted through ceiling tube thru hole 406 a pair of lift handles 402 can be attached on opposite sides of two adjacent ceiling tubes 440 selected for lift handle attachment to prevent interference between neighboring lift handles 402 referring now to fig8 a and 8b each leg tube assembly 500 can include a leg tube 510 a leg end cap 520 and a leg base 550 a leg end cap stem 534 of the leg end cap 520 can be inserted into a leg tube inner channel 522 and fastened with mating bolts 530 the leg base 550 can be adjustably positioned as needed and is connected to leg tube 510 with a leg base connector pin 552 that can be passed through selected leg base adjustment holes 554 on the leg base 550 and a leg tube thru hole 556.