Just looked over this layout one last time and think it is safe to build.
It looks correct according to the schematic above, but let me know if you spot any errors, and I will correct them.
I've added a switch at the input (Labeled: "Gain SW") so that you can toggle between "High" and "Low" input settings, instead of having two input jacks.
I have not had the time to build and verify it yet, but I will definitely build this and trying to add it to my Roland Bolt 60 amp that is lacking the whole preamp/reverb section.
Good luck with your build!
Looking forward to hear about how it turns out.
Cheers!
EDIT: Shaved off one row & updated layout to match transistor orientation. Watch pinout if using optional JFets...! Also added missing info: "Volume 1 to Ground"