Malvina Reynolds - No Hole In My Head tab

Hello everyone, this is my first tab but I think it's fairly accurate.
It's quite simple because the whole song is composed of verses with the same chord progressions. 
The only difficulty with this song is using the correct strumming rhythm.

IMPORTANT NOTES:
For the song to sound correct, when playing each chord you have to alternate 
between the chord and open strings to get the correct tune. 
In order to see what I'm talking about and learn the rhythm and tune of the song it 
REALLY helps if you watch this video of Malvina playing and singing:

http://www.youtube.com/watch?v=4sooNNv9qHg 

CHORDS:

E = 022100
B7= 021202
A = 002220
A variation = 002223

INTRO:

E - B7 - E - B7

VERSE:
[ Tab from: http://www.guitaretab.com/m/malvina-reynolds/174927.html ]
E 
Everybody thinks my head's full of nothin,
E
Wants to put his special stuff in,
A
Fill the space with candy wrappers,
E
Keep out sex and revolution,
B7
But there's no hole in my head.
E          B7
Too bad.


OTHER LYRICS/VERSES:

They call me a dupe of this and the other,
Call me a puppet on a string, they,
They don't know my head's full of me
And that I have my own special thing,
And there's no hole in my head.
Too bad.

I have lived since early childhood
Figuring out what's going on, I,
I know what hurts, I know what's easy,
When to stand and when to run,
And there's no hole in my head.
Too bad.

So please stop shouting in my ear, there's
Something I want to listen to, there's
A kind of birdsong up somewhere, there's
Feet walking the way I mean to go,
And there's no hole in my head.
Too bad.

Everybody thinks my head's full of nothin,
Wants to put his special stuff in,
Fill the space with candy wrappers,
Keep out sex and revolution,
But there's no hole in my head.
Too bad.