Well done getting the Rapman working, I gather they need constant tinkering to get them to work properly.
By coincidence I am setting up a brand new Up! Mini this weekend for a course this week. I decided to try your ring components but having trouble. The parts curl up and come away from the table part way through the build. The arms came out fine and can be seen at the right of the photo below. The bed isn't getting hot enough so will have to contact the supplier on Monday. 
