From: Dennis Gibson
Date: 15 Nov 2002
Time: 12:39:10
Remote Name: 150.203.2.60
OK on the wall thickness. I was planning to arc (stick) weld by stitching as shown on these technical pages (Bruce's replica project).
Using RHS (Rectangular Hollow Section), 1.5" x 1.5" (32mm x 32mm) is a snug fit and will slide over the mid cross bracing and brake cross shaft hangers in one 4ft piece per side.
It looks like the 2mm (5/64") wall is the way to go.