I've been playing around with this circuit, using a MAX1044 power supply, on the breadboard for the last couple weeks so just some observations.
With ear up to speaker, guitar volume at zero, pulling or reinstalling C4 (47uF) changed nothing but i'm using a very well filtered power supply and that may not always be the case so it stays in the final version.
Germanium transistors vary greatly so breadboarding your transistor is essential for fine tuning your component values.
The Geofex document states the circuit bias was usually set between -7.2v and -6.8v but at the suggestion of another forumite i've got mine set at around -4.0v and will end up setting it there in my build. So when you breadboard the circuit stick a 250k trimmer in your R5 spot and don't be afraid to wander outside the prescribed bias points and go with what your ears tell you, then pull that trimmer, measure the value and replace with the nearest value of fixed resistor.
Added the tone control from Joe Gagan's Easy Face and that turns it from a one trick pony into a much more versatile little beast. I've got a 5n and a 1uF cap in the tone control but may go a bit smaller at the 1uF end of things, i'll play with that further.
Output cap is 330n, just what was handy at that moment, will audition other values there. (Last time i looked, your schematic showed a 1n(c5), i'm guessing a typo.)
I'm curious about the MAX1044 switching as well and have it on my PCB but not sure whether i've set it up correctly so interested and hearing back as well.
(ANother typo, R3 from your schematic is a 6k8 in the Geofex document.)
Be prepared for a rocky road with toner transfer, have never gotten satisfactory results, others get great results but i'm sure it's taken a major effort to get to that level of proficiency. Photo resist is a breeze and to me the only way to go.
PCB's done with photo resist, Rangemaster bottom right.