Power hammer

I'm in the process of building my own power hammer. I have built many tools in the past and most of them have worked just like I wanted them to. So I don't think I'll have much problems with this build. As long as I take my time and lay it all out before I start manufacturing I'll be fine with the build. I have looked at some plans that others have built and I can build just as well as they did or maybe better. I used to teach industrial maintenance and OSHA rules and regulations at a Vo Tech so I should not have any problems.
The one I'm building will look similar to the KRUSTEY.