Some constructive criticism-
1. The ceiling is way too low.
Nobody wants to be in something like that, and it happens to be a very long tunnel.
I suggest you raise it so the standard height would be at least 8 to 10 bricks
2. Why use 1x1 bricks to make a wall when you have 1x1x5 wall bricks?
I see in a lot of places where 2 or more bricks can be replaced by 1 brick, you might want to fix that.
3. Gravity Cats old weapon pack?
Bit old eh? This is just my suggestion, but it would probably be a little more interesting if you used Tier Tactical, and not the one on RTB. Download it from the forums, and just to increase even more variety, get Frog's Weaponry.
4. Gamemode Zombie.
Rot's zombie mod is good and classic, though you will need to turn off the ammo feature for minigame in order for T+T ammo to work.
Also, no need to set a certain zombie to a spawn. Everytime the zombie gets killed, it just instantly respawns, no delay.
Instead, set all the zombie spawns down where you think it would be reasonable for a zombie to spawn.
Then once all the spawns are down, type in the chat /hidezombiespawns, and this will set all spawns invisible and undetectable.
Now when you start a minigame, set friendly fire on, and activate the director. You can adjust how many hordes can attack players, and the number of zombies per horde.
