I have a fair amount of experience with Nano+Mozzi & HAGIWO builds, they tend to work pretty well. Very forgiving circuit. Even designed my prototype board for Mozzi a while ago (i will do a v2 with fewer issues eventually)
In addition to Testbild’s schematic, you should consider cross-referencing Pansapiens’, which does things a bit differently, and is easier to read:
Don’t sweat the capacitors, except for the one in the output path, none of them make or break the circuit.
One gotcha you might run into that nobody seems to bother to document: Mozzi has to run in HIFI mode. You have to edit a C++ header to make that happen.