1. An apparatus comprising:a base portion, wherein the base portion comprises:
a base ridge comprising a first section and a second section;
an L-shaped cutout disposed along the first section of the base ridge; and
a T-shaped cutout disposed along the second section of the base ridge, the T-shaped cutout including a front recess and a rear recess; and
a first hood that overlays a first portion of the opening when the first hood is in a first-hood-closed position, wherein the first hood comprises:
a ridge that overlays the first section of the base ridge when the first hood is in the first-hood-closed position;
a first form that rests in a recess of the L-shaped cutout when the first hood is in the first-hood-closed position and engages with the L-shaped cutout to prevent the first hood from moving away from the base portion in a removal direction orthogonal to a cross-sectional plane of the opening when the first hood is in the first-hood-closed position; and
a J-shaped flange on a back edge of the first hood, wherein the J-shaped flange partially encloses a concave region.