Hey man, since Warhill_castle is now in the rotation: It's not gonna work. Maps with one narrow stairway to flag NEVER work. It's either unattackable (2 or 3 people are enough to defend the flag, mauls and shielders to be exact) or once some attackers got to the flag you have almost no chance to get it back as a defender. And that's the kind of gameplay i really hate about siege-maps. Not to mention you are most likely to spawn next to enemies, with a hard way back to the flag.
Attackers should be able to reach the flag in multiple ways, means: Cut a hole in the flag-room and put a ladder get up there. Forces defenders to stay closer to flag, because they have to defend 2 spots now, equals more chances for attackers and smart defenders are still able to defend it quite nicely.
The walking distance from attackerspawn to flag seems good, but the fact that the castle is very small, the gates and frontwalls seem kinda useless to me. Left ladder is probably just as fast. Maybe push the whole thing way beyond the invisible wall and put the ladder on the very back? Together with the new way to flag this could be actually a map i would really enjoy, small castles with much action are very nice, but right now it's utterly useless, tbh :x