The crane base won't move. They'll lift the structure, like they were going to move it and set it down straight east of where it sits. But instead of setting it down they will take the West end of it and move that side between the cranes so it is diagonal between the cranes. Then it will slide past the 2 cranes leading with the west end until the back clears the other crane and they can rotate it back to east to west.
Think of how you'd move furniture around a tight corner, only different, and with a major erection.
Here's a visual...
[ame=http://www.youtube.com/watch?v=9wCXuoiQBhE&feature=related]YouTube - ‪Austin' stuck at the wheel‬‏[/ame][ame="http://www.youtube.com/watch?v=b_phIEDsEPA"][/ame]
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