actually, the real problem is rather that the kata is unsolvable in its current state, imo (no completion since you added your last requirements!). I don't think you can keep those requirements and make something interesting of the idea (mostly because if you keep the current version, the only way to make it completable is to provide an almost step by step algo so that one can find the same solution than yours).

What do you think about my solution? I appreciate your feedback.

Contact me and you will get it, as several tens of other codewarriors already got it :)