Man, I really am addicted. Snuck in a half-hour of tinkering before lunch today. Result is at http://www-2.cs.cmu.edu/~jcreed/font/slavkappen-demo3.png. I'm much happier with the new d and e and h, mostly content with the u and w (although the final stroke on the w may need some shrinking) and the y. No, the y needs to be more vertical on the right and less curvy. Maybe the d should be closed instead of open.

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If you're confused why my f and k look the way they do, check out http://www.romana-hamburg.de/fraktur2.htm.