They'll sure look better than old car wheels and tyres - I've been feeling a bit embarrased when anyone calls, as the place is starting to look like a scrap yard ! (Is the same term used in the US ? - vehicle dismantlers etc.)
But for clarification - this is about knocking-up something halfway useful out of old pallets, for free - and that's not something a migratory operation with thousands of dollars invested in trucks and equipment could possibly be interested in. This is (perhaps) of interest to the back-garden guy trying to survive on a tight budget.
If anyone does plan on fitting braces to the legs, fit them inside the legs, so that they will shed water easily. I did try this a few years back on much thinner legs, and fitted them to the outside ... and then had to apply a wedge of filler, to achieve rain run-off.
Almost forgot - these stands are quite tall (19-21"), as I want to get the boxes in question up to a comfortable working height. All my 'regular' hives are near the ground, on plastic pallets.
Large-frame hive ? No problems at all so far, but it's very early days of course. Should have six large frames drawn by now (I'm feeding syrup whilst they're comb-building) - I'm due an inspection in the next day or two, so will update then