Custom keyboard "layouts"

[porky11]

Perceived idea awesomeness

• Wow, you don't have this yet???
• Would be super cool.
• I'm not sure a lot of people would use it, but I'd love to have it.
• Kind of a gadget, honestly, but why not?

Perceived idea difficulty

• Quit your job first.
• Would need some work, but nothing impossible.
• Shouldn't be too hard to make.
• Like, I could do it.

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Not sure, how it's called exactly. I'm not talking about the order in which the characters appear, but about the key sizes, spacing and so on.
So you could make a ortholinear keyboard (non staggered).