You can access a STEP model of the field at,
http://students.autodesk.com/?nd=kitofparts_view
If you are not a member of the Autodesk Education Community it is an easy process to sign up. Once you are logged in you can set the year filter to 2013 and Category to Competition Field Step. Refer to attached image.
I have modeled most of the field including the pyramids, goals etc, but left off some of the details that I did not think were critical to helping you plan for the competition. Let me know if this works for you.
If you have problems getting the file today, email me privately at
phil.dollan@autodesk.com