Theft prevention.

There's a number of simple things you can do. Install a hidden switch which breaks the electric fuel pump relay or ignition. If you have a tach, you can install a small switch to ground the tack wire. This will ground the coil, and you'll get no spark.

Get one of those lever operated hydraulic brake "holders" used on trucks hide under the seat, and plumb into one of the brake lines.

Figure a way to lock the hood. If you have wheels with slots/ spokes, you can through a plastic coated chain and lock through a slot.