They have a place that sells used house stuff? Here the Habitat for Humanity Restore has all kinds of used cabinets pretty cheap, then you just have to modify a box instead of building one. Can seem where I started and what I ended up with in my Anti Journal Journal linky in my sig. I have a small 3' box that I bought premade and then did my own thing and made a 4' and a 6' box. Can also see where I ran into temp problems in the Shed in Winter and ended up moving them into house....so I may just grow 9 months out of the year lol as power bill jumped a bit.