Hey, i think it's a possible way to play it. (I'll try to figure out the whole 
brigde chords when i have time)
Have fun with it :)

Bb		F
I built a wall
F		Gm	
As tall as a skyscraper
Gm		F
Keeping you away
Bb			F
From my heart so I can pretend
F		Gm
That you don't exist
Gm		F		Eb
But it's so hard to resist

Bb			F	
When all she wanted was heaven
F		Gm 		Eb
To help her find a way to live today
Bb				F
She looked up at the sky for an angel
F			Gm
She was caught in the wind
Gm		Eb
Crumbling and suffering within

Bb		F
I strapped myself
F		Gm
To the bottom of the ocean
Gm		F
Watching you from below
F		Bb
As you yelled my name
Bb			F			
And said "Why did you go? Was it something I said?"
Gm		F		Eb
And I answered "No, precious I just have to go"

Bb			F	
When all she wanted was heaven
F		Gm 		Eb
To help her find a way to live today
Bb				F
She looked up at the sky for an angel
F			Gm
She was caught in the wind
Gm		Eb
Crumbling and suffering within

Dm 		F
And I gave up on you too soon
(?)			(C)
Now you're somewhere under the moon
Dm		F
Alone and scared in the night (??/she runs to me/??)
(?)			(C)
But I'm no where no where in site
Dm	F
Your letters 
C		Eb
read to me so easily
C
Now I understand


You said

Bb		F	
All I need was someone 
F		Gm 		Eb
who could help my find my way through this day
Bb			F	
I looked up at the sky for an angel
F		Gm 		Eb
caught in the wind crumbling and suffering

Bb			F	
All I needed is someone 
F		Gm 		Eb
who can help me find my way through this day
Bb			F	
All I needed is an angel
F		Gm 		Eb
Who can help me find my way

Bb, F, Gm, Eb x2