Great article, Dave.
Nice pics and explanations like you've shown will certainly get some people making their own bins now, no doubt about it.
My worm bin, and old chest freezer, finally bit the dust after ten years. It went through a fire and everything (building it was in burnt down) but the worms survived! Unfortunately the enamel on the freezer burnt off, the freezer rusted out and I had to ditch it.
Speaking of ditches, my latest worm bin is a worm hole. I dug a hole in the ground, off in the shade, about 3 ft by 2 ft and 2 ft or so deep. I throw lots of worm food in there and keep it covered with an old piece of tin. So far, so good. I may throw a bale of straw over it this winter to keep it warm(er).
Shoe (encouraging all to vermicompost)