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To Everyone, Thank You for the input! The area where the tunnel will be is a straight 4' run, no curves, so I shouldn't have any issues as far as side clearance. The depth of the tunnel is going to be at least 12", so there should be plenty of clearance. I'm framing everything out with wood, then glueing high density styrofaom on the sides, etc., then shaping the foam to look like rock... then some paint, and greens, and we should be go to go! I want the under-base to be strong enough to support the weight of the Dept. 56 buildings. Again, Thanks for your insights. Phil
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