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If it's straight, as you say, you could ( conceivably) make a series of identical profiles of the opening shape from MDF, connect them with stingers that will establish the long dimension, and provide a surface to attach the tunnel "skin" which could be card stock or something like this:

http://www.modelbuilderssupply.com/index.p...vq2vpm5dfeltas1

Essentially like building a balsa airplane model fuselage, but inside out.
 
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