A little update on my riveting progress. I finally got all of the angles made and all but 8 are fastened onto the brass sheets.
Milling 3-1/2'' angle to scale = .218''
One of the walking shaft bearings I made about 10yrs ago.
Drilling the vertical support channels.
A few angles almost ready to rivet together.
Tapping some 0-80 threads.
Installing the .040'' dia. rivets by the hundreds. These are squeezed
in a little press I modified.
The last angles fabricated and ready for riveting.
Mock up viewed from inside.

Outside