Given enough time to plan, materials, and space I am certain we could make almost anything you have in mind.

[ A portcullis, now- would that be cheating? But it would look quite stunning in the right light- fabric shifting, the scratch of pen on paper- Red has her going, now. Something light and mindless. ]

If we are allowing a drawbridge and moat, catapults and trebuchets should likewise be permitted. Scaled down, of course.

[ Perhaps she is teaching Red a lesson right now, even if she sounds as though she is taking this quite seriously. ]