Reddit mentions of Exo Terra Digital Thermometer with Probe, Celsius and Fahrenheit

In adult geckos, sand is probably less likely to cause impaction. However, the risk is still there. There are other problems with sand as well, it can cause shedding issues and possibly eye and respiratory issues. It's really not worth the risk, especially considering it's not really even their natural substrate.

As for the females housed together thing, yes, you can housed females together, but it's not recommended. Issues may still occur. Leos are solitary creatures and are always best when housed alone, the only benefit is human convenience. Like sand, cohabitation is another thing that's just not worth the risk.

A lot of guides and care sheets have some inaccurate information, in fact, I'd say most I've seen have something that should be changed. You really have to sort through all the information and facts and figure out what's right, there's a lot of misinformation out there and you really can't trust just one source (though as far as sources go, the care sheet in the sidebar of this sub is one of the best I've seen).

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Anyways, onto your original question. Not too bad, the hat's certainly... resourceful. It does look a tad cramped, can't tell what size it is from the picture but you might want to upgrade eventually. More space makes it easier to fit everything you need to in, plus extra room for the leo to roam. Space saving hides are great in the meantime, bulk-free hides (like coconut hides and paper towel rolls) and hides that fit right up against the wall are great.

Some things are harder to tell from pictures. Temperatures, particularly. If those things on the glass are the only thermometers you're using, you'll want new ones. Those are measuring ambient temperatures, and you need to measure floor temps. Use a thermometer with a probe or a temp gun. Also I can't tell for sure if you're using an under tank heater from the pictures, but a UTH is a must. Otherwise I'd just suggest that you check out the care sheet in the sidebar, maybe stick around the sub, and in general just keep learning and improving.

I'd get rid of the lamp, bright light can hurt their eyes. The under tank heater should be enough for heat, and whatever the lighting in the room is should be enough for light.

You'll need a thermometer that measures ground heat, digital thermometers with probes are best. You can also use a temp gun.

You're also gonna need more hides for him to make him feel more secure, at least one on the cool side and one on the hot.

Check out /r/leopardgeckos too, they have tons of helpful information and a lot of cute gecko pictures.