Architecture of a Castle.

[Midgardsormr]

Even in a high-magic setting, though, magic on that kind of scale is likely to be expensive. Probably most magical threats to the fortress could be neutralized by whoever lives in that wizard's tower. If magic is common and powerful enough to obsolete castles, then nobody will undergo the effort and expense of building them. Ergo, if this castle exists, it is not in great danger of being overrun by magical beasties.

Then again, magic of that kind would make large buildings easier to construct, if the wizards could be enticed into doing that sort of low work.

[C'nor (Outermost Toe)]

Hmm. Now I'm seeing people that have captured, bred, and domesticated Bulettes, and use them to undermine buildings. If you have the time, creativity, and equipment, a castle isn't a big deal in D&D.

[Midgardsormr]

Silo 3D is 3d modeling software with a relatively low price point. It is only a modeler, though. It doesn't have any animation, rendering or effects features of the kind that make other 3d software like Maya or Houdini so cumbersome and expensive.

[atpollard]

Actually, the gate at No. 2 concerns me more than No. 9.

Can a horse drawn cart or wagon make that turn?
If not, then the inhabitants spend a lot of time hand carrying supplies from the wagon outside the castle gate to the storage room near the kitchen … and those 50 gallon barrels are a bear to move.
The main gate (2) probably needs a straight approach.