Thanks for the heads up! I'm actually not playing the RPG. I'm going to start up some Battletech TT gaming in my local circle again. Most are old friends I played with before and will want to play Duel rules.
We could get away with playing any version of the core rules, really. Still, having the duel rules agree with the most current set would be ideal, and if I was going to go through the trouble, why not stick them out there for others to use. Other than delays and converting the ranges, there doesn't seem to be much to do. Still picking through it though for any timing-critical new rule or equipment that may need a clarification on, given the 1/4 time scale.
I will check that sourcebook out, but I suspect it's mostly adapting the old Duel Rules from the Solaris boxed set.
Thanks again!