That opening verse is so good:

Jack that hammer in the noon day sun
Body all a quiver like a dame with a gun
Lines floating girders in the sky o'erhead
Foreman'll use you til you're nearly dead

I like the telephone vocal effects and stripped down backing ( great use of the tabla loop)... and that you resisted breaking out of the form to make it heavier as it went ( though I confess I`d like to hear a version that veers to hard rock as well!).
Very original and creepy cool.

Robert