Very nice, I like it.

If you're on a budget, I'd use black construction paper to cover the three sides of your enclosure (on the outside, of course). If you've got money to spend, I've always been fond of using cork tiles to line the inside of the vivarium using low-profile velcro.

I'd also buy a few plastic plants and put them on the sides where you have holes in your plastic logs, then drape them over so that they reduce the number of holes on the side of your hides as shown in image 2. Personal taste, really, but I like my hides one way in, one way out. My BP hasn't used his Habba Hut since I put in a single-entrance rock hide.

I really like the coconut husk substrate versus the other stuff out there. Good choice.

I really dislike my ZooMed UTH. I'm almost positive that they have a heating element in the center of the pad then use heat-conductive metal sheeting for the rest of it because it seems like the heat radiates from the center. I'd recommend a flexwatt.

I'm not sure if sandwiching your thermostat's probe between the tank and pad matters, but it seems to me that you'd lose conductive heat transfer by doing so. I place mine on the other side and tape the probe itself to the pad, despite that others here would recommend against doing so. Personally, I've found that taping the probe against the pad gives me more accurate readings than not doing so.

Consider yourself lucky regarding your humidity issue. I'm right on 50% at all times and I wish it was higher. Try getting a second inexpensive lamp and a black heating bulb or ceramic bulb and turn it on at night. Those things suck humidity like crazy. Like with everything else, make sure you dial it in first.