Adding fuel to the fire. The map I posted online is smaller than the full res version by half. Actual size at 300dpi is 31 inches x 25.25 inches (9300 x 7575 pixels), at about 10.5MB. I'll probably make that available after... well, just after.
As for the forests, I already created an amalgamated graphic with three tree types (conifer, oak, juniper). Not that I'm some kind of tree expert or anything, but I liked the way they look together at differing heights, widths and colors. Some dendrologist somewhere probably just died a little inside. However, to avoid doing different types of forests in various climates, that was my happy medium.