freestompboxes.org

I recently stumbled upon a video on YouTube where a gentleman modded and switched the housing adding a fourth knob that manipulates the trim pot inside and of course switching the button over to a raised singular EHX style button,Can anyone help me attempt this or tell me the materials I would need I am new at this and I figure this would be a good place to start.I already know what size housing i need and I plan on doing the drilling myself.

thank's!

here is the video!