I think that the error on the 4001 is that they are not usually 4001 (NORS), they are 4011 (NANDS) IC.
I´m going to build it with the 4011 IC because in the SCH are NANDs and not NORs.
I´m going to build it with the 4011 IC because in the SCH are NANDs and not NORs.