another idea i had.. if you're going to do a screen top, you could possibly recess it down a bit and have pieces of wood that go into the drop down (but suspended on the wood so the screen isn't weighed down, i could draw it out in paint if i worded that too confusing). the wood slabs could be put in and taken out to raise humidity as you wish, if just simply moving the water source closer or farther to/from the heat source doesn't do it. i've never seen in done before in herp keeping but maybe someone here has or has an opinion on that?