I recently decided to build a walking beam engine. I was going to make it out of wood and tin cans, I wasn't sure how it would all fit together so I made a cardboard mock up. The cardboard mock up was pretty strong, so I thought, why not just try and use the cardboard to build it ? This engine is the result.
There is a walking beam Stirling engine kit available on ebay to build a similar engine, have a look here
Step 1: Cut Out and Assemble the Cardboard Base and Bricks.