Nope! @Mark Boyce The columns and parts on the bottom are my own design based on a mix of info pulled from drawings, first hand experience, and what would work for assembly. The pieces connecting the columns across the bay are Plastruct. They will be the bottom of the truss when I get around to working out the sizes for the truss.
I'm hoping this structure stiffens up once I add the sides. It should. I might make an appointment at the museum and see if I can dig up a blue print showing the bracing between columns.
