its a tricky one this, to be honest i would probably prefer to just do it myself as i'm using all sorts of variations, 2 controls, 3 controls, led/no led, dc/no dc.
but i am guessing a popular choice would be switch and 2 controls on the main slant, jacks to the back.
or 2 controls and jacks all on the back.
mike if you want some idea of the measurements i am using with my parts let me know.