If you are interested in getting together to develop a human powered saw, I would like to work on this project.
Here is one website showing how to build one. In the latter half of the 19th century there were many pedal-powered saws. With new technology it could be made much more efficient.
http://www.lulu.com/items/volume_1/119000/119697/2/preview/Preview.pdf
if you are interested, email me at
aaron @ yourbodypower . org