I also have a set of drawings for these that I posted to the web site this morning.
The drawings that I posted are in DWG and DXF format and they are for the Tetra Connectors, the Center Goal Bottom Connectors, and the Center Goal Middle Connectors. All of these have perforations on the bend lines to make the bending easier to do by hand (or with a vice and pliers). These are setup to use the 1/4" bolts and the PVC end caps.
We laser cut ours and they all worked well.
Goto the
Holland FIRST Robotics site to download. Please let me know if you have any problems.