I had planned several drain holes about 1.5" diameter which should be plenty big enough to wash mud and rocks out without sacrificing any strength. Plus that's real easy to incorporate into the template used by the plasma cutter.

I'm posting the pics for suggestions though, so y'all can copy them and draw in whatever you'd like and post back into the thread for group review. My hope is by starting a visual dialog between what's desired and what my capabilities are that a couple final designs can be agreed upon. Then I build to order.