Motion simulators have envelope, power, and dynamic parameters that must be considered in mounting a new target scene projector. The newer pixel array type target scene simulators are smaller in size than the older types and generally allow a higher dynamic performance. However, for safety and proper operation the same requirements as gimbal clearances, lateral accelerations, shock loads, vibration, and rigid mounting interfaces must be considered. Ignoring some of these parameters can cause significant damage, high repair costs, and/or degraded performance for the target scene projector. The newer control systems have software adjustments to account for weight and inertia changes to the target payload. This paper discusses the mechanical envelope considerations and performance limitations when a target scene projector is mounted to a moving gimbal set.