I can't help you out with the 1/2 mile irrigated land thing. I do all my speed goat hunting over by Farson and that area is almost all BLM ground where I go.

You've got a pretty good plan with the does though. I do the same thing. I put in for preference points until I can get a good buck tag and get the reduced price doe/fawn tags until I can. For less than $100 you can have 2 doe tags in your pocket.