So, I've been trying to get a 3d topo map of a certain mountain range for a long time. I found this site, I've been using the software, but I can't seem to solve my problem. I've used Sketchup to download the terrain and even scaled it to a reasonable size. I'm not a 3d modeler by any means, but I am a fluent autocad user. It would seem to me that I could just take the scaled terrain model, 'offset' it 4mm, then create a solid from the two parrallel planes, but I haven't been able to do it. I've tried using other free programs like Blender, but I'm out of my league here. Can someone point me in the right direction?