Gitting the pivot lock worked out. Just need to cut the PVC pipe to length and add in a bottom bar...maybe out of wood fer now. I'll have to see if how it will pan out or if I need to change out the wood piece to something else later on down the line.
I'll probably be able to hang a mud flap off of that frame now. I'm tempted to hang the Yosemite Sam "Back Off" one back there.