I collected off cuts of timber studs from skip bins on job sites and made my own design up then sanded back the rough bits of timber so they were all smooth. I then clued and screwed them together cutting the timber to length as I went. I then lightly sanded abit more and undercoated them. Then I put 2 coats of gloss outdoor paint and purchased 2 chair seat pads from Bunnings and tied them on to make the extra comfy.
