If you have a subscription to Popular Science this year then you’ve probably already heard about the Aeroscraft. If you haven’t check it out before continuing.
http://www.popsci.com/technology/art...t-finally-take
Combine this technology with advancements in small-scale automated manufacturing/assembly & you’ve got an as close as real world possible Support Class Crawler.

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Slap a mobile concrete batch plant, a bin for steel Rebar, & a place to store electrician's tools on it & you might have a better comparison.
