Within the context of local type IIB models arising from branes at toric
Calabi-Yau singularities, we present a systematic way of joining any number of
desired sectors into a consistent theory. The different sectors interact via
massive messengers with masses controlled by tunable parameters. We apply this
method to a toy model of the minimal supersymmetric standard model (MSSM)
interacting via gauge mediation with a metastable supersymmetry breaking sector
and an interacting dark matter sector. We discuss how a mirror procedure can be
applied in the type IIA case, allowing us to join certain intersecting brane
configurations through massive mediators.
