Use of federal or state funds to build a pond takes months, even years, to get approval. As far as renting a dozer and doing it yourself, you are better off hiring it done unless you are an experienced operator. I'm not unfamiliar with earth moving equipment, enough so to know it would be less costly and quicker to have a decent operator do it. Not all operator are "go getters", meaning you will pay for time not being used "effeciently". Like paying for 15 hours and only getting 10 hours worth.
Whoever you use, get referrals and honest appraisals of their work. It'll save you lots of money in the long run.
The last dozer I used cost $75 an hour in tandem with a large track hoe ($75 an hour also).
The guys were good and I was well pleased with the work they did. As far as clearing out a fence line, a bobcat with the tree cutter attachment can save you lots of money and time. They make a better stack for burning the brush as well - no dirt berms or mounds to deal with after the brush is burnt. But you may have to deal with the stumps cut flush with the ground when driving t-posts in for the fence. Not too many, but a few.
Hell, if you want to shoot MGs, I've got a place close to OKC that you are welcome to shoot on.
About 30 miles north of Lake Hefner. Thinking about trying to raise a night shoot up again soon if we can get some participation. I don't think anybody is really interested in 90+ weather.
Maybe when it cools off!