How long can you survive?

You are trapped in an arena, with only a chest and a tree. use the items inside the chest and the tree to build what ever you will need to survive the zombie invasion. (The zombies will only spawn if you press the button)

RULES:

1. play on easy mode
2. you can only brake blocks like: cobblestone, wood, leaves, chests, dirt and beds.
3. do not brake out of the arena.
4. do not spawn items.
5. do not use mods like smooth moves and flying etc.
6. this map can be played on multiplayer, but don't kill each other.

If you had any problems then let me know in the comments.

future plans for this map:

.Add zombie spawners instead of having eggs and dispensers.
.Probably put some cows in (this might make it a bit too easy though) (That would make it too easy. I'm not going to do this)
.Add a bit of food at the beginning and some rewards. (hopefully)
.Set a proper spawn point.

I will try and get to work on these changes as soon as possible.

(Notice)

I am currently working on a zombie invasion map part 2. if i can ever get to upload i will. im leaving this one for good because its i want to work on other stuff now.