Here you can see where I have finally come back and cut the whole and slot for the rear axle. Doing it this way allows me to unbolt the cassettes and simply drop the whole axle out the bottom.
This is a view from inside to show how I cut right thru the frame rail I installed for stiffnes. Now that I have my cut out I will go ahead and weld each side to the edge.
This photo shows how I weld the rear plate in. Idea is to make this thing one solid frame assembly.
