Remember to predrill, predrill, predrill. If you don't, you will have alot of stripped screw holes and cracking particle board(or melamine).
I just reassembled my 41qt rack, replacing the melamine sides with 2x4s. It's such a hissy, pissy material to work with, LOL. I am assured now that it hates me with the passion of a thousand hearts(or so my friend Shawnna says).