Thanks guys! @Tflynn I went for a long ride yesterday that had just about every kind of terrain you can think of, and it handled everything great! I was mainly concerned about the bed moving all over the place and rattling, but I have it strapped with bungee cords in a way that doesn't allow it to even budge. And @Hondasxs I'll take that as a compliment! haha but let me see, I think I paid around $40 or so for the 1" PVC piping, 10 90* elbows, 8 T's, and then the cost of the spray paint and cleaner/glue for the pvc. I got five 5' sections of pvc and I have one 5' section leftover with some scraps, so I'm sure if you got about 20' (four 5' sections) of 1" PVC it'd be more than enough.
I'm very happy with how it turned out, and it was even more satisfying to know that I saved about $200 because Honda's is $250!