Built my first trellis out of 2x2's and bolted it to the cleats attached to the beds. Still need to attach the netting. I am still a little concerned whether it's sturdy enough. I'm just picturing a a netting full of vines in a high summer wind snapping the thing off. I still have some time before the trellises come into play, so I'm going to think about it some more.

It was in the 60's today so I had my parsley, broccoli and cauliflower out all day. I'll probably leave the parsley out overnight now that it will be transplanted to the garden in a few days.
UPDATE: Went back to Lowes to brainstorm a bit and came up with another trellis configuration. So I picked up the materials for one prototype and threw it together at home.

This is 1/2" electrical conduit slid over 4 ft rebar pounded halfway into the ground (just like the book says). The key that makes this all an affordable solution is -- rather than using those metal conduit elbows that cost $5/ea., I used cheap 1/2" PVC elbows (threaded on both sides) that cost $0.56/ea. I just hammered them on the ends of the pipe. It seems the threads compress around the pipe when hammered on. I couldn't pull them apart at all once on all the way.

I swear I saw this mentioned on someone's blog someplace, so I can't take credit for it. I was just reminded of it as I walked down the PVC fittings aisle. I did a search but couldn't find the post, but if anyone reading this knows, I'd like to give credit where credit is due.
Time will tell if this will hold up, but I think I'm going to outfit the rest of the boxes with this type of trellis and see how it works out this year. There is some give, but I think that's good/expected. The rebar is 2+ feet into the ground, so I can't envision a situation where they'd pull out. I also like the fact that they're physically less bulky than the 2x2's so probably easier to store as well.