This is a great setup and one that I am immediately sending to my wife (@spolitte) who has been wanting something similar for years. For now, after we dabbled with small raised beds for several years we finally just built some giant beds (see here).
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Very nice project you are working on. I got the feeling that you guys have been bitten by the gardening-bug too.
I started with only one square foot bed three years ago, and it seems I can’t stop. Last year I’ve expanded big time, and this year I would have if it wasn’t for the surgery. I’ll have to postpone for another year, lol.
Good luck, and I hope you will finish the job soon!