Yes Bob, I agree. KISS... Keep it simple. Wire a "kill" switch in-line with the ignition, up under the dash.
If somebody really wants it bad, they'll pull up with a flat bed, cut your chains or steel cables and haul it away in a few minutes.
You can add a simple "auto" alarm and "auto" remote starter kit for under $80.
My friend points his remote control from his living room window, starts his Zetor in the outside shed... by the time, he has his coat on and walks outside over to the tractor, it's warmed up ready to go. He boards his tractor, points his other "remote" control at his home built underground "wood" boiler and hydraulic arms lift open the top of his furnace so he can dump a "cord" of wood into the furnace... but that's another story.../w3tcompact/icons/smile.gif