General questions and discussions.

Oh man( How is that possible? You mean if I built, for example, a Dimension Door, and I know the opponent might arrive soon, I can't rebuild the tower so he doesn't get this Dimension Door for free? That is definitely bad.

And another situation: after building and researching an imp, I can no longer rebuild it into a Dimension Door? And vice versa, etc. own? Well, that's just not right(