A really successful project, blessed with good luck in sourcing various free materials of the right size and shape. Standing it on pyramidal shaped concrete pads was a great idea, and good alternative to sinking them in the ground (using stone in this way has a long history of course). The photos convey lots of info on the construction process and scale, if someone wanted to copy it - with recycled materials, measurements are likely to vary or need adapting anyway, so plans are not necessary, as this build demonstrates well!