I can't begin to imagine how you could construct anything satisfactory, in anything but wood !
And I think that would look pretty snazzy !
When I got my 'birdie a couple of years ago (ex USA), it arrived with a cracked p/u ring. Couldn't find a replacement anywhere on the 'net, so resigned myself to the fact that I'd just have to live with it that way.
I sent it to the Doctor, 200 miles away to check / adjust, and damned if it didn't come back with a new p/u ring !
He had one among his bits and pieces !