no plans, Dave, but I can give you a quick description of what we use. Pine 1x10s cut to 4'(or5') 6" length. On each end, cut in at the corners 3"x3", giving the end of the board a tounge that is 4" wide and 3 deep. Cut a mortice (rectangular hole) in the tounge center that is 1 1/2" wide and goes from 2" in to 3" in. You should end up with a board with a slightly smaller tounge on each end with a rectangular hole in it.
Those are your shelves.
The sides are 1"x10" also. Cut slots in them for the tounges to push through and use wedges on the outside inserted through the hole in the tounge to set.
Easy to build, inexpensive (cheap), durable, works even with tollerances off up to 1/4", simple to set up, attractive, breaks down quickly and with no screws, and stores in small spaces.
Good luck,
Dietrich