yes you could have a second level with the tunnels. I would attach risers probably pieces of 1x4 cut to 7.25 the put a layer of 1/2 MDF on top of the legs in the area of the mountain then build the tunnels under the MDF and add the second level track on top of the MDF and build either another tunnel on the second level or build up around the track to give the image of the train running on top of a mountain but not just a flat top mountain . kinda like this
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