>>450303/k/ dropping in
Supposing /k/ would be charged with defending the mildew ridden pile of torn wallpaper in OP's pic, I would station the nuggeteers in the upper windows and preferable in any wall holes, as lookouts and observers. Semi acurate fire would deter most creatures, and nothing on earth can take a x54mmR without feeling pain.
That would be about 8 guys, 2 to each corner, or one to a corner and one to the wall between said corners.
Below, a garrison of AR-15 guys. The immovable blobs. The Gear-fags. Put them to work at the second and third levels. Have lots of dakka aiming at any forest approaches. Their bodily weight should be watched however, as it could compromise the structure's integrity. The one person who brought a shotgun (there is only one, ever) would best be served as internal messenger and relay, in event any 2spooky critters breach the ground floor line.
More nuggeteers and spam cans in the ground floor.
The strategy: If any opfor overrun the valiant 1st floor /k/ommandos, the second floor defenders merely have to jump a few times to pound a new fire escape in he floor, smothering the wendigos or druggies now picking the pockets of poorfags underneath.
Their extra gear serves as a shield, makes them an immovable turret of dakka. While one or two may get swarmed, the shotty master will have nice clusters of OPfor to remove.
with new holes in the structure, the third floor garrison would split into two teams, first team goes down to second floor and deploy more dakka down on opfor. Any homemade explosives are used, but as a last resort, if OPfor reach the third and fourth floor.
Things will never get that desperate, however, and we would defend the house, even if everyone gets the EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE from lack of proper ear protection.