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Well, I will show you some pics of my mountain tunnel. I made mine out of 2" foam stacked and then carved/sanded down to shape. http://community.webshots.com/photo/109373438/205281499jUbLXW this is the mountain after I have shaped it and patched it with some plaster cloth. Just remember to paint the inside of the tunnel before you put the top on it. http://community.webshots.com/photo/109373438/205281618xbIMHg I put the tunnel portals in place and, after making sure that the foam on the inner tunnel did not stick out when the portal was in place, I supported the portal and filled the gaps with expanding insulating foam. I used a latex-based foam called DAPtex, but it dried soft. I don't know how it will react with the insulation foam currently on the layout, but I know that Great Stuff dries harder and thus will create a more stable scenery base. http://community.webshots.com/photo/109373438/215080325HaPeex Then, after I shaped the foam and the mountain to create a more gradual transition to the portal, I covered the insulation foam with plaster cloth, providing a better scenery base. As this photo shows, I also covered the inside of the tunnel transition with plaster cloth. That's the basic idea. Reed
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