To Ghostlight (and whoever else might want to try the base)
make a 15x15x3 (or 15x15x4 if you wanna be safer or build on uneven ground) slab...outside should be your strongest material, but the 7x7 on the inside can be anything...I use flagstone.
Now make walls on top of that...all the way around. Leave 1 door on one side. Make a ramp up to the door. Leave the door open.
Now you've got an elevated base with a ramp leading right in. you're half done.
Extend the side walls past the open door...past the ramp, until you've got something like a 15x15 courtyard in front of your base. make sure there is a walkway all the way around (this will narrow the courtyard to something like 9 blocks wide, but the point is that the zombies have a good 15 block walk from entering the courtyard until they've climbed the ramp into your base...which of course will have the only access to the walkway you're standing on).
You want the outer wall of the walkway/courtyard solid, so nothing can draw LOS to you, and the inner wall of the walkway as bars...even wood works here...its' just to stop the spiders jumping on you.
Now line the walls of the courtyard with electric fences (this is super important...slows and roots them for easy headshots and turret work). Meanwhile you stand over the entrance to the courtyard, facing inwards (towards the "front door" of the base). Set up any turrets there, Junk turrets are great, SMG and shotgun should work. They work because due to the angle, you're firing at the back of the head of incoming zombies, since said zombies are entering beneath you, running forwards (away from you) and being shot from behind and above them.
This is nothing more than a
classic medieval castle killing field but adapted for this game to fire into the backs of enemies...since demolisher triggers are in their front.
Meanwhile as defenders, we'd have one of us (or one weapon, if solo) as a high-powered, armor piercing shooter for the demolishers while the other person/people pop irradiated heads. If a demolisher WERE to be triggered, both players swap to SMGs with drum mags, AP ammo, and rod & spring and blast the body until it's deleted.
_V_Raised Base_______V_open courtyard, raised walkway
OOOOOOOOOOOOOOOOOOOOOOOOOOOOOO
O_____________DWWWWWWWWWWWWWO
O_____________OWWWWWWWWWWWWWO
O_____________O_________________WWO
O_____________O_________________WWO
O_____________O_________________WWO Zombies enter here and run towards the ®amp
O_____________O_________________WWO
O_____________DRRRR________________ <-----
O_____________O_________________WWO Players stand on W and fire at zombies passing underneath
O_____________O_________________WWO
O_____________O_________________WWO
O_____________O_________________WWO
O_____________OWWWWWWWWWWWWWO
O_____________DWWWWWWWWWWWWWO
OOOOOOOOOOOOOOOOOOOOOOOOOOOOOO
We put a drawbridge in the back, precisely because we don't like cheesing the game either. Drawbridge makes an entrance that CANNOT be accessed by zombies, and for a reason OTHER than their AI or action limitations.
This base and defense is abominably expensive to build, but it works AMAZINGLY well for us. It doesn't cheese the AI any more than actual traditional medieval defenses (raised fortifications were the way to go precisely BECAUSE you could choose what side was attacked). Even if a random zombie does get stuck whacking a wall for a bit, they always eventually recalculate and "find" the path in (we often have blocks around the outside damaged a token amount in the morning...none of them ever even get to half unless we've been firing at them).
Now, if my impression of your past posting history is any indication, this is where you chime in that this base completely won't work with 64 count zombie hordes in 5 player games on warrior difficulty at 200% zombie horde night damage or something similar, because I've noticed that your trend seems to ALWAYS be to make a comment to the effect of something not working once the game gets harder/you turn up the difficulty/you have 64 zombie count/etc.
What this base DOES do, is allow us to absolutely steamroll 16 zombie count hordes on nomad difficulty at 100% block damage in a 2-4 player game. It very likely could handle more, but I haven't given it a try yet.