Other than not having the thing fall apart due to poor construction the two things that I think is important to the health and playability of the guitar would be the box folding up/neck resets and a playable neck. Not using squirrely wood should help out for the neck. The body caving in can be determined somewhat (thanks Tevor) by measuring the bridge rotation without strings to the guitar tuned up. Trevor has in his book that a 2 degree rotation is about what a high performance guitar ends up with. Greater than 2 degrees might show that you have not enough structure for the tension. Mind you if we make the guitars too stiff then they may fall into the realm of factory guitars. Mind you, that may not be a bad thing when first starting out and approaching the precipice with caution.
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Fred
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