Building a world (quite literally).

Howdy I'm nearly ready to GM a new campaign; after a bit of a break, a swap of system, and setting and I was looking at advice on a cost effective way of building gaming terrain to suit a Savage worlds sci fi game. I'm hoping for some advice on buildings, verticality, and general interesting terrain. Obviously cost, effort, and capacity to recycle all interest me as it's obviously going to get quite a bit of use and the same map again and again isn't so interesting. Thanks AL