It's not a complex circuit ,, just bread board the basic audio path (Q1 and u1A/u1B) as that is the heart of the tone,,the rest is switching and buffer which is not going to change the sound.
Try changing the values of the caps (C21,,C24) until you are happy as that's enough to give you an idea of what the end result will sound like.
Be aware that most pedals lack headroom and are already close to the limit so any boosting will colour the sound somewhat as it will hit the rail faster and add more edge.
Now if the bandwidth of the whole system is HiFi wide (a common issue) that extra fizz will start to sound very unnatural.
If using Acoustic with Piezo active preamp then you can easy turn even the most expensive acoustic into a tin toy tone.
If you want to boost (Electric or Acoustic) you must remember that the wider the bandwidth the faster you will run into trouble maintaining well rounded tone. If you want good control with acoustic you need a Parametric EQ and use deep notch CUT somewhere in the mid band and restrict the hi end to keep it mellow. Para EQ works best in Cut mode,, boosting often trashes everything.
Back to your quest,, go download some simulation software and take the time to learn how that works. It will be hard to start but ten times faster once you learn ,,,I'm speaking from experience.
I could simulate your circuit in about half an hour and change the values many times over to give a super fast understanding of what values will have the most effect.
Saves lots of solder and I'm not friggin around inside often delicate tiny little boxes.
Phil.