Man you are right. I just spent 10 minutes on the google and found no information on building a house for carpenter bees. However, I found this website: http://www.buzzaboutbees.net/index.html
which has some good info on all kinds of bees.
Here is what it says about carpenter bees:Do I Need To Get Rid Of Them?
Some people are keen to get rid of carpenter bees if they discover they have them, however, these types of bees do not usually cause significant damage, although some species may cause damage. Carpenter bees are more inclined to make their nests in rotting old or damaged wood. This can lead people to believe it is the bees themselves who have caused the damage, but very often it will be a sign that the wood needs to be replaced in any case.
Bees are excellent pollinators of flowers and plants, and that includes carpenter bees. It is better to engage in preventative carpenter bee control, rather than using pesticides or trying to kill carpenter bees. Maintain woodwork, keep it well painted and in good condition. These bees are not out to make work for themselves by selecting hard, painted wood that will be more difficult for them to bore into!
Do you have a really bad problem with carpenter bees? I have a wooden house and now I am thinking I should check it this spring for any evidence of them.