Hi DR ... Graham White of Edinburgh Beekeepers has published details of these types of floor. See also this page of a commercial one by Alan Wadsworth. I see that these cost £32 ... I reckon mine cost about £3-4 plus a sheet of wire mesh (and I'm hoping to stock up on the latter from the cheapo offerings at the NHS).
I make mine slightly differently and have just written a brief article for our BKA on them. Once they've knocked together a PDF I'll be happy to send you the link. Better still ... here's a picture of one I built this w/e for a nuc. There is an entrance block in place (the unstained wood) ... Jon would be proud, the landing board is Correx
Figure 4.jpg
The only problem I've ever had was when an overwintering double brood managed to pack the entrance slot with corpses during a prolonged period of very hard weather. I now nip round once a month or so with a specially constructed high-tech tool to clear the slot (a bent coathanger).
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