The pasty face

[nicknick]

Hi,i want to do the PASTY FACE project and i couldn't found the 500ktrimmer. Reading the guide i realized that there's an alternative for this but i can´t figure how is it. Would you please tell me how the layout would be. I'm doing it from the single sided layout which is the last diagram in the guide and the same Ready to transfer PCB and also im using the Sola Sound Tonebender componentes .I'd be so thankful.Sorry i'm new in all this DIY I apologize.