It's not my project, but I too was impressed by the craftsmanship and the end result.Well done Wrooster! That is some nice work you did.
That said...
Here's a pretty good example of what I am aiming for.
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I have to ask, why are you married to that container? The two example structures you have shown can be built fairly rapidly using standard wood stick framing on either a true foundation, or even a slab. Trying to "expand" a container might end up to be more work.
I'm sorry if I sound like your wife.
What is your total desired square footage?
Wrooster