Today I went to my arranged temporary work shop and started making new Foot Drive brackets.
The new brackets will be 2 inches longer than the originals to accommodate the swivel caster wheel I'm adding to the design. I'm also lowering the drive wheel axle by a quarter inch for better ground clearance of the foot shell. Otherwise, the design is the same.
Thus far I've drilled most of the holes needed and, using my Dremal, cut out the drive wheel axle slots on the left bracket.
Next week I hope to finish cutting and drilling the brackets so I can get started on the center foot caster and then the new legs.