I'm glad I read this. I hadn't really considered the router flattening jig option.

For me, this may be worth considering, as I'll have to spend a few hours and probably at least $20 in gas to get to the hardwood lumber store. I wonder if I could build a jig in that amount of time?

I'm continually amazed at all the woodworking tasks that can be accomplished with a router. The only catch is that most of them require a jig, which means more time wasted on side tasks and less time spent on the actual project.