Due to the difficult of this circuit I abandoned the idea of making it with veroboard, I was adviced it was nearly impossible to make it that way. Then I contacted MBC (thanks!!) at http://www.guitarrista.org because I saw in a thread he had one that he cloned some years ago. He send me this:
The words in spanish say, basically, that he added a depth control and remove the two stages of the speed control, using just one.
Forum member chasevie is helping me with the drawing. We are going to take the pedal to the original features, so we have drawn the pcb with pcb express, resulting this:
Instead of the original resistor that fixed the depth we are going to place a trimmer that will allow some tuning...
It seems the thing is going to happen... more chapters to come!!
i visit a flea market everytime i go to my mother village but all i have found is an Eko Ranger XII acouctic guitar with a broken neck for 10 euro. it is still in fixing progress... 
(only one) 
