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Bruce, the design/build is my own and I got a lot of ideas from other ROR observatories and also a garage that I was having built at the same time. So while the concreter was around I asked him to do the slab for me. If you have many hands to help, you can do this yourself and save some money - unfortunately I didn't. The steelwork cost about $2.5-3K and I built it myself.
I looked at kit sheds. Though a lot cheaper, I could not get the size and arrangement that I wanted. Most don't have a frame and for stiffness rely on the roof being in position. If you don't have a roof you need to add a frame to provide the support for the walls. By the time you add this the dollars add up anyway.
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