Those look good! Any dimensions/design plans so we can build them, too?
Thanks to home depot, it can't be any easier.
they sell their melamine in 2'x4' pieces which makes getting them home easy. I used 17 of these boards to construct the 7' rack I cut 1' off all the boards that will be the shelves.
I use 2 full 4' boards for the sides of the smaller racks. On the 7' rack I had to cut the 2 upper side boards to 3' cuz me ceiling is not 8'.
so every board but your sides gets cut to 36''. don't worry about that 1' of each board as they will get used later.
Then its pretty easy, place 2 tubs on the first level and put a couple of folded index cards or something on the tub corners for spacers. all you need is a couple of 16ths of an inch spacer.
place the next shelve on top of that and secure in place( coarse sheet rock screws, I use 1-5/8" screws. take the time to pre drill the screw holes to prevent the melamine from splitting when putting in the screws.
then just keep adding shelves in the same manner all the way up.
when you finish the first shelf, check your spacing to ensure the tubs slide in and out easily but not too much space to allow escape.
Now when your done take those 1' left over pieces and cut them to use as center support in the middle of each shelve. This will prevent sagging of the shelf later down the road. Now each shelf will have 2 spots that will hold a tub. I do not use casters as I feel they could only lead to sagging later.
and to dress it all up nice, there is 3/4'' iron on melamine to do all the front to cover all the unfinished edges. Oh almost forgot, I use pegboard for the backing. Hope this is not too confusing, sorry its long. hope it helps!