I made my crate from an Itso Cube. I cut a lid for it from some polyethylene sheet, and hinged it with zip ties. I have a 3 rod rocket launcher type holder bolted to the back, and I made a holder for my pliers from a piece of PVC. I have a divider inside, and it holds 3 Plano 3700 boxes plus worm bags and several smaller tackle boxes. It's pretty big, and won't fit in a lot of kayaks, but it fits both of mine well. I made a couple of handles from paracord, and it works great!
Dad took me fishing when I was 10, and I've been pretty much hooked since. He went to be with God on August 14, 2012. I miss you, Dad.