|OK - your ready to build the sides.
Lay out the same number of flat pieces as you used
for the back. (The length of these pieces dictate how
deep the bin will be.) Once again, ensure that there is a gap of
at least 25 mm between them for ventilation of the heap.
Next, fix these together by laying a flat timber on
top of them down one side and nailing or screwing it to
each of the slats.
Repeat the process to make the second side.