Kappa village

So I have been working on the Kappa village. It's already usable, but I personally didn't really feel that it was big enough.

That's why I expanded it and made the industrial district so to say. The thing that I currently feel that I do not have is ideas for the buildings.
Currently we have a smithy, a diamond factory and a cloth washing building.
In addition to that we have 8 pipes supplying the city with lava and water from a lava lake and the lake on top of the mountain.

If anyone could suggest any buildings that would be great.

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Residential areas for the Kappa? Sort of like a steampunk-like, Industrial Revolution apartment would be a nice touch.

That's exactly what the houses in the second picture is.

That was my original intention, but it sorta didn't work out :(

how about a laboratory?, A place that looks like the construct high tech weapons. maybe a few stores that have redstone piston doors. umm oh and a power plant!

Maybe there could be like a dining hall or something where the Kappa could all eat?

Could anyone go any do the interior of the two last buildings. I will be away for the next two days so I don't have to much time.

As for the ideas so far:
Laboratory: superb idea, go for it. Just one question can you make it look lab like? Kind of hard how I imagine it.

Piston doors: I already settled with a more open door type. It's hard to fit a piston door into a small house like that.

Power plant: Pretty much done, it's onderground tough so there is not much to see. Just a few pipes running around where there was spots for two houses before.

Dinning hall: I would leave that for the living area. Some of the houses in the living area is unfurnished so if you have a idea go for it there.

If there is no idea about what do do with the last two houses I was thinking a butcher and a tailor.