Probably a similar scenario comparison would be Twisting Tower except it would be carried from one floor to another. Another comparison to Stone Troll Crossing. Stone Troll has one spawn and three drop-off spots but this has One spawn point and one delivery per realm.
Because the castle is vertical in nature it makes it simple to jump off the top when carrying the orb, while being chased by the other realm.
If that player is killed then the item is destroyed and it will respawn at the top of the castle.
The main problem I see is that it would be nice if the castle bridge was on both sides so it was more symmetrical, then spawns could be on either side..
Or perhaps the towers would be the player spawn point and the houses delivery points?? Hard to tell that much from the pictures...
edit:
had a better idea for spawning - players arrive on opposite sides of the ramparts via some kind of 'tossing' mechanic (like from a catapult). They will land on the sides or on the towers, and maybe casters can port to the towers similar to College of Corruption? Could have multiple ingress methods such as these.
thanks!