I can modify the standard to do exactly the same and better. That one in the link offers no security of movement after heat cycles and you would hear the valves & piston going at it like rabbits soon enough.
Once I do all my measurements and testing, bearing in mind though I will be drawing this out with other ideas in near future I may even sell them as cam packages to suit a few different cams. That's a pie in the sky at the moment, need to buy house this year and setup a shed, my workspace at the moment is pretty limited