[mafribe]

That's not what your question asks for.

Anyway, in my experience, the ability to test with ease is one dimenision of design quality.

[RussianCow]

How is that not what was asked? The phrasing of the question makes it immediately obvious, at least to me, that the OP was looking for a design critique. (Unless of course the question was edited since you wrote your initial comment.)

[enraged_camel]

>>That's not what your question asks for.

Maybe you didn't read it, but the question clearly and explicitly says: "Be brutal and honest about what you think of my code structure and style."