Holy Cow!
I installed Redneck Rampage into DOSBox again, to play the Rides Again missions in coop with my girlfriend. That way I came lurking back to the 3DR forums (last time: Nov 2009).
I also installed DNMP some weeks ago onto my W7-64 machine, and was sad again, that there were never some really cool addon campaigns or levels (at least nothing with at least some decent quality that I know of).
Now I read your pretty current thread and you're telling me that you're working on some?!? Great news!
I also used PrismEd back in the day, but found it too awkward to build all that neat stuff that makes DNMP more than just your average 2D-Shooter. (Also the lack of decent documentation / tutorials bothered me.)