The top bar hive is aimed more at the Hippy (need spaced out smiley) casual bee keeper. They are supposed to be Bee friendly and not geared for intensive honey production, cheap and simple to make. I did some alterations in the garden removing a rockery and without realising dug up an underground bee hive. It was only small but felt pretty bad about it and remembered the Top Bar I designed some years back so decided to post it.
My apology to the Bee's Suppose I should build a hive too, and see if any of the locals fancy moving in, as I enjoy watching the bee's in the garden.
I'm not a Bee keeper, but I did take a course on Bee keeping.