A small mirror (1-3/8"  X  1-3/8") attached with 5-minute epoxy to the outside of the payload bay, allows a view looking down the airframe.  Lens hole in the airframe is 1" in diameter.

Fiberglass cloth and 20-minute epoxy formed the fairing over the mirror.

Liquid expanding foam poured inside the payload bay.  Space for the camera was created by inserting a piece of wood, roughly the same dimensions as the camera, and letting the expanding foam cure around it.

A small launch lug leads from the camera's "on" button to a small hole on the outside of the payload bay.  This allows a toothpick or some other narrow object to be inserted to activate the camera before launch.

A small plate glued to the bottom of the nose cone depresses the camera's shutter button when the nose cone is fully inserted onto the payload bay.  The camera "beeps" continuously while capturing video.

Camera was launched on an Aerotech "INITIATOR" with a G-40-4W motor.

Ramsey Electronics describes SPYPEN as "about the size and weight of a candy bar" with 2-AAA batteries installed.  I've also launched it successfully on a D-12 motor.