Well, after much procrastinating, and shifting project priorities, I finally got a start on making my Big Dummy useable.
Trying the DIY route, just to see how it turns out. 3/4" EMT conduit is the perfect size tubing for this, so here we go.
First, create a layout table, marking the angles and dimensions as found on Extracycle's open source documents.
Then, start bending the conduit, checking angles as you go.
Test fitting the tubes.
Zip tied two panniers on one side just to try it out for size.
So far so good.