You can lower your budget with the use of the cheaper ABS piping instead of PVC. Check with your plumber to see if this is a viable option because it can cut costs dramatically. In addition to plumbing costs for a kitchen or bathroom, there are also costs associated with an electrician. Regardless of the addition, you are going to need electricity. Often, a new breaker must be run from the main panel in addition to the various boxes needed to deliver power to fans, outlets and light fixtures.
A square bale of hay is usually 2 feet wide, 4 feet long, and 2 feet tall. A round bale of hay varies, depending on the baling equipment. The dimensions usually range from 4 ft x 4 ft to 4 ft x 6 ft. Edit: There are three sizes of square bales, small medium and large. Small bales are 2'x2'x4'.
Hay is sold by the bale here as it is too much trouble for buyer and seller to fool with the nearest scales 15 miles away when they are open. I measured a couple of JD balers (530 and 375) both doing a 5' wide bale and the bales were like 62 x whatever you set the diameter to.