That's why I like using a hollow core door, it's big enough that you don't have to cut up your plans.

But anyway, here are a few suggestions for you...

Pieces get lost easily. here's how I aviod this.

Get some zip-lock bags. Any time you open a plastic bag full of parts, empty the resy of the parts from that bag into the zip-lock. That way those little buggers can't escape (they do it all the time!)

Next, get in the habit of laying the top of the box next to the bottom, and any time you are searching for something, remove wood from one box, and place it in the other. That way, if you ever have trouble finding a piece, you know it's in one of the two box halves, and not hiding under something on you work bench.