So far so good, just needs a frame (which I don't know too much about)
I would suggest combining the cyan piece with the navy blue piece but I see why you didn't. It might make it time consuming to combine them.
Perhaps combining the brown(?) and navy blue pieces together and having a de-volumizing spacer hold the cyan piece in place? that would reduce waste stock and add volume adjustibility to the design.
I would like one of these, I'll see what parts I am capable of making.