Sure, it's definetely possibly. I could easily picture it with todays modern steel coasters. Assembly would be much like the actual construction. The track would come in peices, and so could the supports. I think it might be interesting to have a full scale model of Nitro, or Millenium Force on my desk. However, unless they were sold in the park gift shops, I really don't think that there would be much of a market for it beyond the enthusiasts.
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I'd Rather Be Riding Rollercoasters
www.mycoasters.homestead.com/mycoasters.html