The web pages which follow provide step-by-step instructions for building a deck on a 2v optimal dome. In fact, you could build a deck on any geodesic dome. It took me about eight hours of labor to construct the parts, except that I already had some pieces left over from previous projects. I'd say this is a good weekend project.
If you are also planning to construct the dome on which the deck will rest, build the dome first. It makes no sense to begin the deck project until you have the dome finished and assembled.
If your dome already exists, set the dome up. And, when you build it, make sure that the bolts in the top pentagon of the dome point out. You'll need to attach right-angle brackets to those verticies. Also, the very top bolt should point straight up and should be long (e.g. 6" or 8")
For complete information on building a 2v dome (or other types of domes, try these links:
Building a dome deck:
You'll need to stake your dome down with at least 5 pieces of 2' rebar (1/2" thick), pounded in 18". Put them at every other vertex around the base, at a 60 degree angle to the ground. They should be inside the dome and cross the vertex, so that the tennis ball is outside the dome. The rebar should be in contact with the vertex.
Cover the ends with a tennis ball that has had a hole cut in it. The hole should be slightly smaller than the diameter of the rebar. You can get them out with a vise-grips by using a twisting motion as you pull them out.
Here is a list of tools you'll need:||
Here is a list of materials you'll need.