Oh wow, I'm not the only other scatterbrained person who thought of using deer antlers for snake things. =D
Pewter on Antler
Hypo Lavender on Skull
My other free (no skull attached) antlers are adorning MY viv at the moment, sitting on my mantle around a candle.
Nice roomy viv, btw. My only qualm is with the "latch". Rubber bands just don't do well over time, and I've found the ones these days don't last a month when stretched out constantly, and end up drying out and breaking when you don't intend. You could take one of those latches where you turn the bit sideways to slide the clasp over and then turn it vertically to lock it, just bend the clasp around the corner of the viv so it'd match up. Either that or a nice quality bungee cord.
I don't think your snake looks terribly thin, I have seen a lot worse around here. But he does look like he should be fatter on such a diet, especially for a male. Most of my males get one large mouse every 14 days, or else they get pudgy. So there may be something else at work that a fecal might show up.
If you get one done, let us know if anything abnormal shows up. But for now, 2 mice every 10 days is fine. Its honestly more than I would feed a male, so I think if you feed more you'd be risking regurges as well.