Although not essential, a target range would be useful. MPD cops can train on it, and Mayhem Armory customers can try before they buy.

Depending on what type of range you want it should be easy enough to bash. An outdoor range all you really need is a pavilion (for a covered shooting area) some shooting benches, and then the target stands themselves (wood posts with a 2x4 near the top and then one near the bottom for attaching the targets).

An indoor range would be a little more difficult, you still have the shooting benches, but for the target you would probably have it on the rail in order to place and retrieve the target without having to go across the firing line. The rail might be able to be made from the Mayhem Armory Garage Door Rail kitbash. Though the problem I see with this is the mounting of the rail, it would be mounted to the ceiling.

You could always build an indoor shooting as a flat (no interior).