PBBans

If you can spend - $8,100,000,000,000,000 - then you have the capital you need to fund the constration of your own Death Star.

The Project time is 833 years and you will need 1.08×10¹⁵ tons of steel - planet earth has enough iron for 2 billion units, if one is not enough.

http://www.geek.com/articles/geek-cetera/build-your-own-death-star-for-8100000000000000-20120218/