I'd do it in a box, too.
I'm trying to drawn the layout of the new and bigger schematic, but I'm not so good with the protoboard. I'l post it later.
The g-taper pot... I 'm not sure, but w-taper could be about the same, and the tape is very important in this schematic, else you will have almost no effect except at the extreme pot setting.
I build pedals