I built it and it works. But i must admit, that it is very noisy. The Noise can be reduced a little bit with an 100R resistor between 9V and the circuit.
And i think that the connections on the Gain has to be swapped. 1&2 should go to the 47uf and 3 to ground. Just take a look at the Sabra Cadabra and the Heat pot from the Naga Viper. With this changes it sounds better to my ears.
Finally got this one finished and tested. Layout worked fine for my build. Loads of gain. I did swap out the 47p in the tone section. Little too much high end for my taste. i swapped in a 10p. Tone is much more usable with the 10p for my guitars and amps.