The Construct.
It is based off of a Tribes 2 mod which is slowly dying.
Features: a fully functional deployment pack which creates items(A support beam, etc.) All can be created and placed anywhere, with any size wanted. You can make walkways, blast doors, and support walls. The basics for this is easy. Create. Create houses, blah, anything. Comes with a gun to rotate support beams and such, and to 'push' stuff foward to make slants or 'pull'.
Saving is possible and saving individual buildings is possible when you tell the latitude and longitude(on laser pointer).
Comes with any kind of force field and just about everything can be used if coded into the mod.
There is no boundary limit in some maps, but those maps are completely flat with no mountains.
Here is an example of a tribes 2 construct mod building.
