Newbie excitement questions... I hope not to annoy!

Hey all! This seems like a great hobby, but more than that, an excellent community of top notch folks! I'm still not sure I'm gonna take the chicken plunge, but I might just hang out here for the wholesome conversation. What a respectable group!

Part of the fun with this would be building the coop. I enjoy streamlining the cumbersome tasks. I enjoy thinking it through and building it right the first time. But, I'd want my chickens to be happy chickens. And some of these ideas my not sit well with chickens. With your best chicken voice, let me know what you think of:

1. A plastic or fiberglass liner on the inside surface for ease of cleaning...

2. A PVC plumbed flushing system funneling materials to a collection or straining system for composting...

3. A coop largely built into the side of a hill side for climate control...

Anyone ever seen an underground coop? Do chickens require heat?

I realize if these questions are answered in other threads, this can look like a lazy newbie. I definitely don't want to get myself labeled lazy! My wife and I have been looking at others' coops for ideas. She leans toward the ones that look like little play houses. With daughters and a wife, me and the neutered dog, the only masculine features of this coop are gonna be the creative features, so I'm all about the details!

I'm even contemplating installing solar panels...

Thanks ahead of time,

Lance