The word "cheap" and what you are describing don't fit together. With fuel prices the way they are and not actually seeing what you are doing, hiring somebody to go out there with a dozer and a crawler loader and putting down some sort of road base, this could be a $150K problem. I could see having 1000-1500 hours tied up, a 80 or 90 horsepower unit will go thru around 4 gallons per hour (rough guess) at around $4.50 a gallon. Your least expensive way out of this is to go buy some decent used equipment and learn how to use it, maintain it, then when you finish, put it back up for sale. Doing it this way you are still going to have $75-85K tied up if you bought the equipment right. When it's done, if you didn't tear up the equipment too bad, still recover $30-45K when you sell them. About 15 years ago I read an article about the most expensive thing the government does, it's not war, armed forces, or welfare. It's new road construction, this estimate put new road construction, from the point that they just have the idea of building it, to the lay out, purchase of land, engineering, materials, etc, to when cars are actually using it, at $50 a square foot. I'm sure that number has doubled by now.
