I spent some time tweaking my version of the Warden class, which I’ve created for S&W White Box and Labyrinth Lord, and now have a version just for 3LBB OD&D. The main difference is that the animal companion is gone. I also re-worked and added a few wilderness skills that I have kept deliberately simple, with d6 resolution in most cases, and added level titles. Click on the image below for the PDF. Feedback welcome!
Incidentally, the font is a free (GPL’d) one called Universalis ADF that is a close match for Futura, the font used in many old TSR supplements.