Any good online stores that sell steel tubing of these sizes?
40 x 20 x 1.6mm
35 x 16 x 1.6 mm
and 25 x 13 x 1.50mm
or something very, very close to those dimensions.
I can't seem to find them anywhere...
I also tried looking here http://www.onlinemetals.com/product_search.cfm
but I could not find any, or perhaps I missed it somewhere.