My 2 cents: use un pressure treated lumber for your grow boxes. Use the other for projects away from your garden. What about the plastic lattice that is already colored? You wouldn't need to paint.
If you find scrap lumber for your grow boxes, you won't feel like you have waste money if you have to replace them in five years.
You can build your boxes of filled plastic water bottles. The water would then become a solar collector, extending your growing season into the fall, and getting you started earlier in the spring.
There are community gardens in California who form the edges of the beds with a "sleeve" filled with hay. I think rectangular hay bales would be a great idea anywhere where it's real cold. It's something to think about here in Florida, too, especially if you have easy free access. Because I see it really enriching the soil on down the line.
I love my raised square foot gardens!! I can't wait to get up in the morning to go check on what's happening out there. Hope our first killing frost holds off until after I go to North Carolina in 10 days.
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