One person on the door would be basically pointless because the attackers are closer to their spawn than you are to yours. 3 defenders could not successfully defend this tower against an attack of 5 or more people. You seem to think that people don't die while they defend towers lol. The long hallways is probably where most defenders would be that's where the offense would have to push. I see no huge difference in this than in the grassy area in swamp, or the side stairs in deadwood. The thing that makes it stand out is the fact that there's no one door which people block. This leaves a disadvantage for the defenders which is substituted with the large walking space. I personally think it would work fine. And honestly I was expecting more complaints about it being to hard to defend lol.