I weld as a hobby, and last year was my first time, and so I also originally planned a dome for Burning Man. I like the futuristic moon outpost aesthetic of a dome, but I think there are more functional designs if you can give up the moon look. I think that for the amount of floor space you get, they take an awful lot of materials and are time consuming to put together on the playa.
With your metal fabrication skills, and especially if you have access to a real shop with pipe benders, shears, brakes, and all that good stuff... Well, I think you could do something really cool that might fit your needs and aesthetic better than a dome.
Someone on Tribe made a neat chopped pyramid thing, which he documented in the Shade Structures group.
With just a MIG welder and a bandsaw I made a 24x24 equilateral triangle thing out of aluminum and steel. It takes three people about half an hour to assemble the frame, supports six hammocks, has only three types of pieces (60 4' long round poles, 24 angle connectors, and rope), and doesn't really need to be staked down if it's covered with mesh shade cloth.
If I had the ability to transport it, I'd love to make something that has a large second floor observation platform that is still as solid as my triangle thing and assembles about as quickly.
Anyways, something to think about before you rush into a dome project.