Finished the knees. I used Dana's knee plates and hinges with Dewey's fiberglass knees. I had a gloss latex paint mixed to match the color of Dewey's rubber legs and used that to paint the knees. The knees are screwed together, the hinges held in place by hidden set screws (nice feature Dana!). The rubber legs are attached to the knees with 6 machine screws on each leg.
These pics show how it all goes together: