The quick construction is pretty much the rule for any steel coaster these days. They're just big erector sets. Once the pieces are on-site, all you have to do is bolt them together, tighten it down, smooth the edges between track sections, do a pull-through, then finish with the grouting (the cement layer between the footers and supports). These things are so precisely manufactured these days that they go up in a hurry. Heck, once Millennium Force's towers went up, the rest went up in a hurry. Ditto for Batman at SFO.
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Jeff
Webmaster/Admin - CoasterBuzz.com