Those pieces of natural cork are so beautiful, I think. And all those nooks and crannies would hold moisture well for the roots. I've had miltonas do the accordian thing on me and have had to keep them quite moist. That's my main reservation about mounting. But if you tie on some sphagnum around the roots that would probably help too, don't you think? My "expertise" is exhausted here. I've only ever mounted a B.nodosa and usually steer clear of miltonias until I get my GH some day. Some have the touch with them, though.