This is a cool project. I have been working with an amazing social enterprise called Reclaimed Timber Traders. They have a huge yard full of wood that has been diverted from landfill. Part of their mission is to provide building materials post disaster around the world. But instead of sending a shipping container full of wood, I had the idea of pre-assembling an emergency shelter that can be put together by two people in half a day using only hand tools.
The design is a hybrid post and beam using dimensional lumber to form the mortise and tenon joins. Here is a post made from three 2x4s nailed together. (Note this has been screwed together quickly for a photo op with the local newspaper.)
This prototype can be used as a model to ‘mass produce’ structures that can be flat-packed and shipped around the world or sold locally as a sleep-out or garden shed.
A great day and lots of trigonometry!