Engineered wood is where it's at. Structural microllam beam type material you can get in 2x4 dimensions. I don't have prices handy any more, but it wasn't a whole lot more than nominal lumber. They're always straight, never twisted, more resistant to water, stronger.
Here's a pic from a local cabinet maker / reefer.
http://www.richinscarpentry.com/gallery/images/gallery/amazing_aquarium_furniture/clean_out_016.jpg
Here's a pic from a local cabinet maker / reefer.
http://www.richinscarpentry.com/gallery/images/gallery/amazing_aquarium_furniture/clean_out_016.jpg