I build my own as well mainly because I think they look better than plastic trays (perforated or not).
I use cedar, but often use treated lumber as well with no ill-effects. The new standard chemical for treated lumber is not as toxic as the stuff formerly used.
May I also suggest paying a visit to the joist hangers section at any big box home center. Beat the heck out of screws and nails that eventually work their way loose from even the best boxes. I find the joist hangers really make a stout box. Here's a pic. Note that stump ways about hundred pounds by itself. With the solid the box weighs at least a hundred fifty to two hundred pounds.
http://bonsainut.com/forums/attachment.php?attachmentid=15475&d=1300842903
Have no fears lifting that box.
I use cedar, but often use treated lumber as well with no ill-effects. The new standard chemical for treated lumber is not as toxic as the stuff formerly used.
May I also suggest paying a visit to the joist hangers section at any big box home center. Beat the heck out of screws and nails that eventually work their way loose from even the best boxes. I find the joist hangers really make a stout box. Here's a pic. Note that stump ways about hundred pounds by itself. With the solid the box weighs at least a hundred fifty to two hundred pounds.
http://bonsainut.com/forums/attachment.php?attachmentid=15475&d=1300842903
Have no fears lifting that box.