I would absolutely build such a kit, but here's what I'd demand for my money:

1) Every included component would have to be high quality. As you described, for example...wood should be contest grade, and actually BE contest grade, not just soft wood labeled as such. It should be hand selected by a knowledgeable kit builder BEFORE being placed in the kit, with the same care as the builder would use selecting his/her own wood. High quality hardware, and extras, like wheel pants, canopy, etc.

2) Completeness. At that price, I expect not to make a SINGLE trip to my LHS or favorite e-tailer until it's time to start covering, except for basic building tools like glue, blades, etc. In other words, I shouldn't be out looking for a canopy, a cowl, linkages, or wheels. At that cost, EVERYTHING I need but covering, radio equipment, and power plant should be IN THE BOX.

3) Accuracy. Laser cut parts would be essential, and I'd expect EVERY one of them to fit perfectly. At $600, I am NOT prepared to do any "reworking" or "reshaping". Obviously some minor sanding for a flawless fit is acceptable, but cutting new parts, or reshaping existing ones, would be unacceptable.

4) Desire for that airplane : This isn't one you can do a whole lot about, since it's purely subjective on the part of the builder...but at that cost, the aircraft would have to be EXACTLY something I wanted...not "close, I can bash it into one of those" or "I don't really need one, but it flies well", but PRECISELY an airplane I wanted.

5) Uniqueness : Along the lines of 4 above...An Extra 300 kit might be SUPERBLY done, but it simply can NOT be done well enough to justify spending the same money for it that one can buy a HIGH quality ARF of the same airplane for.

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Meet all these criteria with, for example, a top notch large scale warbird, or a unique biplane, or something along those lines, and I, for one, would be interested.