@Pitbull, no idea on cost as yet. It will depend on the number of forum members interested, the costs for laser cut parts, as well as resin for the cast pieces, and if I can find a new supplier for the springs.
Actually, Pitbull's question brings up something that has been on my mind. The hinges are not complicated to make, it just gets tedious around the 4th one. Those of you who are interested, would you expect all pieces cut to size, and drilled for you or would you find it acceptable to be supplied the appropriate diameters of brass and styrene tubes and cut/drill the hinges yourselves? :ninja The instructions will be straight from my development notes, and should be pretty clear. I will give the correct lengths and half the cuts are 90° and the other half are 67.5°. I could probably even bodge together a template for cutting & drilling.
Obviously, less work from me means cheaper kits for you. Any thoughts?
If I haven't burned myself out on this completly, I am also considering making two finished keys. I had planned to put them up on eBay, but RPF will get first dibs. Those will be a bit more expensive.
Cheers,
JM