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Late to the party, but just built another one of these:
Fine chicken wire on the base (to stop rats burrowing under - possibly overkill) - under the sleepers on all sides, covered with weed suppressant membrane that comes up the sides and is sandwiched between the top 2 sleepers to stop soil leaking out.
Corner brackets and then massive timbascrews to tie the layers of sleeper together. (For which job I should have had an impact driver and now have a couple of inches that won't go in any further with my current tool selection.)
Oak sleeper raised beds - line them with something? If so, what's recommended?