So, after some discussion with @rempesm and others about the alternative builds of the Scaler, we decided it needs a topic to discuss the options.
I have layed out the ALT B schematic with the values as described in the Alt B BOM.
(newest version from Github)
This might shed some light on the question if this version scales from 0-1v to -5+5v
As far as I can tell, the voltage reference is used (R30 and R31 have specific values) to pull down the voltage to get bipolarity. U4 is placed (but for some reason C5 and C9 are not)
R4, R18, R6 and R20 are not mentioned in the ALT B BOM .
I set these values to 100k, as used in the ALT A BOM and schematic.
C5 and C9 are DNP, but U4 is still used?