Following Bionic's original posting, I've so far made up six one plant versions using some free Tesco's square buckits, some rectangular buckets (designed for paint rollers I think) that cost about £1.99 and a couple of quite large planters that were about a fiver (for my poshest plants!). I'm not such a craftsman as bionic (and could really have done with a vice to hold the pipes steady) but they seem to have turned out to be functional and although I didn't make any topcovers (perhaps next year) the plants seem happier than the ones in the ordinary containers.
Because of their size I don't think I could leave as long a gap between waterings as an Earthbox would allow but I can heartily recommend the method. Thanks Bionic :)
It's going to be really interesting to see what the roots have done when I empty them out at the end of the season. If they've hung down into the water reservoir instead of just using the wick, I might line the wire base with some weed control fabric next year.
