Army Base

[Dr.Q]

The plantation is near the barons house - drive around for a bit.

The doctor is probably still CGL locked. The trader's Convoy mission is a random encounter in the restricted zone.

With the Blue Sun mod, there's another NPC weapons modder Stefan Uribe who will join your base - then it starts to produce free militia.

I've also found out how to get the alternative story from the bandit in Santa Maria. You have to talk to a civilian first about some men on the run, that will open up his more profitable demise.