I have started making the final piece in wood, brass etc using the measurements and setup from the test piece.. This is the first time i have done it this way and seems to work well. As previously mentioned I am using the tinplate gears from the test in the final one. No point remaking them! Its hard to see but here is a vid of me turning the crank and gears.
It will have the same large gear on the other side. Both will then turn the cams as seen in the test piece vid