Marble Machine #1.1

Am I allowed to derive my own marble machine?
I revamped the previous machine, taking out the screws and the bolts, making the spiral slightly wider so that the balls run around it. Tidied it all up and squared the unit up so the looks better.
This and all my other items can be found on my blog including kits for sale.
http://msraynsford.blogspot.com/2014/01/motor-marble-machine-12.html