I'm running it with OSE. I used your Hinterland tools to generate the rough map, and then the party navigates with Trail Mix rules. For encounters, when I roll a creature on the Encounters step, I then switch over to the OSE encounter tables to decide exactly what was encountered. Its running pretty smoothly at the moment.
That's great- I haven't tried OSE, but I expect it's similar enough to BFRPG that my test rounds were pretty close. I'm glad it's going well. I've got some more detailed encounter building stuff coming soon, so hopefully that will add a bit more to the experience as well. Also mechanisms for climbing and caving.