To create the frames for the boxes, they bought outdoor deck hand rail spindles. They are 3′ long and have a 45 deg. angle cut already. This makes it super easy to make them the same (no cutting involved).
They put 1 screw through the ends of each spindle to hold the pieces together (in a square). They found it was best to pre-drill all the holes – to keep the wood from splitting. They also pre-drilled the eye hook holes.
Next, they attached a piece of spandex to the frame by stapling it across the back.
Then they added their eye hooks and hung each piece off some extra chain link they had.
They found that front lighting it worked wonderfully. They’ve had the panels for almost 2 years now, and all but one has survived (the prototype). It cost them about $350 for the set.
You can find more detailed instructions on how they built these on our Steven’s blog.