Jennifer, I know resources are limited and the focus is on the National Bicycle Hwy Network but I wish you would consider the following routes in Canada:
1. Seattle to somewhere in Alaska
2. Routes around the Great lakes
3. Trans Canada Hwy.
Have you ever thought of partnering with groups in Canada (ie Trans Canada Trail or Route Verte) Initially use their maps and you supply the trip detail ie., camping , motels , food, bike shops, medical, etc,. (they might even consider adding mileage lines) This would be a win win for all. It might save you resources intially, build your membership in Canada, and provide bicycle tourist much needed information.
It is like the cart before the horse or more appropriately, the trailer before the bike, instead of waiting for the interest to build up, you might initiate the interest. It is worth considering, eh