Well, treadle powered tools have been around for a while too :D. I really did this to test the concept I had for a treadle powered grinder.
What I actually use now is a modern belt grinder. This whole treadle project was the product of some spare time and some curiosity. Again, I was quickly hammering out the concept. Lots of refinement necessary for sure.
Thanks for the links though, cool stuff for sure. One day I may put together a whole shop full of weird homebuilt tools. But in reality, the real power tools I have will have an edge in the performance category.