Yes and no. The concept merely houses the information necessary to recreate whatever is held within. The creation itself depends on how well one can manipulate aether, as well as how much is available.

[He gestures to the space around them.]

Here, for example, the aether is [a grimace] either unnaturally thin or unnaturally difficult to perceive. Either way, even those of us who aren't abysmal at aetheric manipulation would be hard pressed to bring even simple concepts into being.

[In an instant, his smile returns, a twinkle in his eyes at some private joke]

And all that is before we get into all the boring, bureaucratic aspects that go into approval.