That's a resounding 'no' on the coffee cups.

I pitched the concept to some woodworkers and this is what they had to say:

"Unless you coat the timber in a few mm of epoxy (then you won't be feeling wood) dishwashers will make a mess of timber in just a few washes. In the long term, hand washing with any sort of soap will also eventually mess about with most natural finishes.

I like your basic idea but wood is just not an appropriate material for coffee cups. A true coffeegeek will tell you that coffee cups should be ceramic or glass to retain heat. While wood will do that, the feel on the lips is the next most important thing and wood just does not feel right. Metal is also a poor choice because it conducts heat too quickly to the lips. In a barista competition (I have judged these) a wooden cup would cause an outright disqualification because of hygiene concerns. Wooden food containers are best left for salads or nibbles"

neeeeext...