Pyrogeorge and me are working to make visco machines, however my thoughts are on a timefuse machine.
I am thinking to create a thick visco like machine and then coat with tar or plasti dip (www.plastidip.com) liquid plastic to prevent side spit. Usually timefuse has 2 or 4 treads going in the BP core and one layer of 12 or more threads outside with the external coatings (tar and paper).
Blaf's images and constructions were an inspiration for many people around anyway.
As for the cost, since we don't have it at all then it sure worths it.