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I think for starters domes would be too much to transport and too difficult to assemble on site. How about this: Seedwing flyers just like in one of NASA's TechBriefs to land supplies and gear on Mars. Mining machinery like the Australian opal mines or coal mining machinery automated to bore into mountains. The seedwings could be made for diassembly as structural parts of a colony. With a trench, add roof and airlock. With mountain, add airlock and take advantage of existing walls and ceiling (and insulating stone). Mountains are resistant to meteorite strikes, very difficult to burn, and Mars has several in a range of sizes. Why haul up dome materials early on?