This is awesome, I've dug a nice little house into a cliff in infdev.
And pigs and sheep spawn INSIDE IT DURING THE NIGHT because of how well-lit it is

I also have two observation windows that look outside, and I'm going to dig a chamber close to the surface and glass the top of it, for a crop greenhouse. There's a forest up there, so I'll get more wood for burning for glass as I haven't found much coal cause I'm not ranging around enough, apparently.