I am posting a few other pictures of my footpedals. The only 2 improvements i am showing here is the change to a turnbuckle from the rocker board connecting to the valve handles. That makes it so i can adjust how the board moves the valves and how much play is in the connection.
The other thing is i added a toe stop on the rocker board so i can feel where my foot is a little easier.
I hope these help you build yours. Post some picks so we can see what you come up with.