Shell
Outer/external surface, exterior, case, shell, husk, outer layer, facade, front, surface, outer side, skin, crust, covering, sheath, elevation, and frontage.
Outside
Outer/longer edge, the long way round, edge, and outside.
Exterior
Exterior, outer, outward, out-of-doors, external, outermost, and outdoor.
Consulting
Independent, consulting, temporary, casual, non-resident, extramural, extraneous, outward, foreign, consultant, hired, freelance, visiting, external, peripatetic, extrinsic, and alien.
Externally
Outdoors, out of the house, al fresco, exteriorly, out of doors, on the outside, and externally.