After a few more diddy tests, the foundation has to have a worker construct it at least to have 2 hitpoints, before being replaced. And the total hitpoints cannot equal the maximum hitpoints or it will be considered "constructed", and will be a movable unit. Foating units are not movable(excepted turned by face object trigger effect), and have no attack or civ abilities(ie. charge, run, or monsoon).
Moving can be done only by turning with face object effect, or "tasked off map and tasked in area x". Planes will move if replacing an unfinished foundation, but will have no attackin ability or circling ability(will just sit in midair). And if a totally unconstructed foundation is relaced by a plane, the foundation will fly away without being able to be completed, as well as if tasked to an airport will land at airport, then make it undectible and prevent any further planes to be built or land at that airport(u would have to kill it, because it would be a useless building).
Also if u replace a foundation with a zepplin, the foundation will enlarge, and hover in the air(not movable).
[This message has been edited by _o0XxX0o_ (edited 12-02-2003 @ 03:48 AM).]