Hi Gavin.
Won't have time until next week but shouldn't be TOO difficult.
If nobody does it first I'll give it a try.
It should fit in a BB box like the original.
I would eliminate those transistors to make it smaller.
Not sure why the guy called it "famous" but the videos I've found seem nice.
Also need to find the time to add 3 vintage Electro Harmonix layouts on the main page if people are interested:
2 from the forum (Black Finger Compressor/Sustainer & Full Double Tracking) and a new Octaver Multiplexer (70's and Modern).