Looks Good!
In looking through your photos, I got an idea. on the first photo, showing the back of the machine where you added the stiffeners. You could drill a vertical hole through the stiffening tubes and add in a removable ~3/4" or 1" diameter bolt, with a nut welded to the bottom, approximately 12 or do from the roller end. That way, if you need to do something that is probably a bit thicker than you should be with the size of the machine, but that has the bead work all right near the edge, the bolt would stiffen the frame a great deal and allow more force at the rolls.
I'm not sure if you "need" more stiffness, but if you did, and your throat didn't need to be so large, it would make it very rigid.
John
Everlast 200DX
Everlast PT185
Shoptask 3-in-1 (not currently in my garage, but I own it...)
Any day on a motorcycle like this that ends just needing parts and labor is a good day.
4.82, 158.67mph 1/8th mile 7.350, 200.35mph 1/4 mile