There were a few constraints for the design. The longest piece of plywood I had was 1640 mm long. The tree had to knock down
easily so we could store it. I sketched out a rough plan on paper and refined it using Sketchup
. The shelves are 300 mm apart, with the two sides offset by 100 mm. The other piece of plywood I had was 400 mm wide, so that's how deep the tree ended up. The Sketchup file below was close to the final version I ended up cutting out (note: it's been uploaded as a .zip file, because the file uploader doesn't seem to allow .skp extensions any more). The main difference is that the shelves ended up sitting on top of the branches, rather than being fitted inside them.