When you say you "aren't getting a lot of overdrive" are you saying that you
a) Don't have much DISTORTION when the gain knob is turned all the way up?
b) The gain knob does not increase the OUTPUT when you turn it up?
If it's a, it's probably because you used silicon diodes. It's going to be cleaner because your clipping threshold is higher.
If it's b, there's something else wrong. The gain pot should boost a lot.
Also, this is not a "high gain" pedal. There isn't a ton of distortion even when using the correct diodes. It's made to push an amp into its own overdrive. The added distortion in the gain control is just icing.
Also, although you can't post the schematic here, it would still be polite to post a link to the build document so people can see the layout you're working from.
You'd also probably get more responses if you posted your voltages.
Finally, you boxed up your circuit before testing it. This just adds more factors to the equation - the switch, the box itself, the wiring ... it's always a good idea to test a PCB on a test rig before you put it in the box. It doesn't have to be fancy. You can make a test rig for less than the cost of that PCB with a breadboard and some jacks.
Finally, saying that something "doesn't work" but that you're sure you've wired it correctly is ... a little illogical. If it was wired correctly, it would work correctly, right? It's possible that there's a mistake on the silkscreen. You have to go by schematics as a backup. The pictures you posted don't allow us a clear, unobstructed view of the wiring, which makes it impossible for us to verify that you did it correctly.
