Some notes: 
- It is a tight fit (as every layout I'vve done for my pedals...) but it should work ok (I haven't built it yet). 
- I used the same spacing for resistors  and caps: I left three free holes under each component, so they will be soldered five holes apart, which is fine for resistors and polyfilm caps. 
- Polyfilm caps look like resistors in tthe drawing, but the tag over each component will tell you what it is. 
- I added R0 (pull-down resistor). 
- I substituted R52 with diode D1, as inn the original pedal, and therefore renamed D1 as D2. 
- I added a 10k resistor (R57) from the  bass pot wiper to ground, as in the original pedal and in the original hand-drawn schematic by Chris (he probably simply forgot it in the .pdf file). 
- I added a 10u cap (C40) beetween R45-66-7 and Q1 and a 100k resistor (R56) connected to 4.5v between C40 and Q1 because this looks more similar to the original pedal. However, you can jumper C40 (and leave R56 out), if you want. 
- You have to figure out by yourself whiich pad connects to which offboard component (that won't be hard), because I couldn't tag them. 

Giulio