If you are going to own the property I think the money is better spent on a permanent, cheap structure. It could be an old pull behind camper dropped into a permanent spot with a pitched roof added (those flat roofs are the Achilles heel of campers) , a steel building (Quonset hut style), or a simple small cabin. The floor can be packed dirt (very common until 100 year ago and they have a number of advantages) so all you need is walls and a roof. Add a woodstove, portapoty, Coleman Camp Kitchen, propane stove, propane lantern, and propane heater, a couple of camp cots from Cabela's with gear hangers and you're in business. A stop at the local Salvation Army will let you add table, chairs, and cooking gear for about $50. The Quonset hut is easy to assemble, inexpensive, and durable.
Below taken from
http://www.steelbuildings.org/Building_Descriptions.html#quonset
Quonset Hut Steel Buildings:
Most guys who have had at least 55 birthdays will likely remember quonset huts from their military days. Named after Quonset Point Military Base in Rhode Island (where they were first introduced) a quonset hut is usually defined as any self-supporting structure, usually in an "arch" or curved shape. There are no interior posts, trusses or support beams of any kind. The exterior sheeting IS the building. Imagine a giant tin can, cut in half lengthwise and set on the ground. That's a quonset hut, also referred to as an arch building.
To assemble a quonset building, you'll first lay out on the ground each individual section of the arch (each single piece of the arch is usually no more than 8-12 feet (3-4 meters) long. Then you bolt all the sections together to make the first full arch. You'll then pull up the assembled arch and attach it to the foundation. Each subsequent arch will also be assembled on the ground, pulled up and then attached to the other standing arches. Each arch is usually about 2 feet (1/2 meters) wide. To make the building longer, you just add more arches. End walls may be provided by the company, you can build your own, or you can leave one or both ends completely open.
Quonset hut steel buildings are generally available in two different styles. First is the old-fashioned "full arch" steel building (the semi-circle shape) and, second, is the newer modified quonset, which has perfectly straight walls and then a curved roof with a traditional gable end peak or a round peak. This design is sometimes described like a giant "loaf of bread" or a "mailbox" . The modified quonset buildings are becoming quite popular in that they have eliminated one of the biggest problems of the older full circle buildings: there is no wasted space on the sidewalls since the walls are completely straight.The width that you need for your building will determine somewhat the style you can use, since the modified quonset buildings are usually available only in the narrower widths of 18 to 40 feet (5-12 meters). And if you want grain or crop storage (something stored against the walls), you'll have to stick with the full arch building, not the modified quonset. Full arch buildings can store grain; modified arch buildings would burst like a ballon with any weight pressure on the walls.
Quonset building can be attached to the foundation in one of two ways. First is with a baseplate connector. You'd have a flat, level concrete pad and the then you'd bolt the baseplate to the concrete, and then the building would bolt to the baseplate. The second method (the more traditional method) is to use the trough method. As you form the foundation for the concrete, you have a trough, rathr like a reverse curb about 6 inches wide and 8 inches deep. You assemble the arches and set them into this trough, and after all the arches are up and secure you then go back and fill in the trough on the inside, and go outside and fill up the trough. Now she's all sealed up at the base and secure.
There are wide variations in the quality of quonset buildings based on the type of steel (grade, coatings, tensile strength) the gauge (thickness) of the steel, end wall configuration, door openings on the end well, foundation attachments, door options (either sliding doors or garage doors) interior height, and the amount of on-site work necessary to erect the building. When you are shopping for a quonset hut steel building, be sure and address these important areas!
