I had a lot of papercraft terrain some years ago, mostly WorldWorksGames. Their fold-flat modern building are great and I used their system, with some modifications, to create my own designs, as you did. Filling a table with nice-looking terrain can not be done cheaper. With a few props here and there (again, WWG has all kinds of modern city props), the effect is very convincing. And if something gets damages or ripped, just print it out again, cutm fold and glue, and for maybe a dollar in ink costs and half an hour of work you have your replacement
