Interesting map, JL. A couple comments/questions:
Would the green Cinci district really be that much a swing district? At first glance it appears a lot of GOP voting area from the current OH-1 has been removed for a more Cinci-dominated seat. What's the likely PVI?
I'm not sure that magenta version of OH-2 is quite that strong GOP. Although the new territory added still generally tends Republican, other than Highland and Gallia the PVI of the added areas are notably closer to even than most of the current OH-2. Schmidt could have increased trouble holding this district (though of course anyone but Jean Schmidt should make either version of OH-2 safe GOP).
Any chance Montgomery and Clark counties could be mostly combined for a swingish Dayton-Springfield district? Both counties now have a slight GOP PVI lean I think (or about even with Montgomery). I suspect both counties combined would be too many voters for a single district, so it may depend on which GOP suburbs would/could be cut to bring the district down to appropriate numbers. I'm wondering if that can be done to include both cities and still maintain a competitive district?