Either add the mods from the BGC+C.SE.7z to the BigChadGuys+C Modpack or download them individually:
zenith
zenith-attributes
fakerlib
ancient-reforging
create-contraption-terminals
create-bitterballen
bellsandwhistles
interiors
create-metalwork
create-crystal-clear
levelz
libz
gobber

Optional:
show-me-what-you-got