[boris]

"Go BACK to the literature and learn a bit about the work on new, super-strong composite tanks."

I work with those tanks on a daily basis. New and 'super-strong' and very, very costly.

So: either very heavy or very expensive. Take your choice. And remember what happened to the X-33 tank.

--Boris

[Wonder Warthog]

"So: either very heavy or very expensive."

Prices "do" come down with mass production. If built as "one-off" assemblies, the typical family automobile would cost $100,000 (as do the limited production "super-cars" that are built that way).