[quote=Heroic]
Land- Years of mining operations will be sufficient, and it'd be harder to find a small galaxy of solid iron than to just mine up everything you need elsewhere.Mass- Same.Space- Void.Gravity- Gravity control mechanisms are in place to keep everything from falling apart... Or together.
[/quote]

No, the space it's made of, the area it takes up, the matter. And do you know how much mining it would take to be sufficient? You'd literally strip multiple universes of 100% of their resources. What if someone wanted to inhabit one of those areas?