Nice map, and good luck with the plans. The Holy Grail! :)
Cool to see ChesCo. putting out this excellent data! Philly has good GIS data, too, as I'm sure you know. This Wissahickon Map
is from the Philly streets data + PA Lidar, via Karttapullautin + OCAD and some monkeying.
I edited a version of Karttapullautin to run in Linux, and added some scripts to do the downloading and chopping up of PA Lidar files to run across a cluster (when it's not otherwise busy), so I can do Karttapullautin maps (nice DXF contours) very, very quickly. I need to convert the latest version to Linux. I also need to test some automagical OSM > Karttapullautin importing, too. Once that's done, I could render the whole state, I guess.
Fun, fun stuff.