Here's some photos of work in progress: https://goo.gl/photos/N6jiAo9696QJG6KU8
I am a mid-twenties millennial looking for a starter home (considering a container home) and I'm not really seeing something I want.
I'm not seeing what benefit do you add to the existing ecosystem?
The reason you anchor on that 80k number is because custom building usually has a lot extra. Better quality. High cost materials. More carpentry. This is basically a plywood box and a solar system. And a solar system of this size is only a few grand installed.
Get a designer in your team ASAP IMO as I think the styling is going to seriously hamper you in the short term otherwise.