> Beans: Draw a warning to intruders on whiteboard.
It seems you won't leave this TREEHOUSE sufficiently BOOBY-TRAPPED with the items you have at hand, but you can still attempt to convince an intruder the joint is BOOBY-TRAPPED anyway.
Any intruder reading this will have their MINDS abundantly FREAKED. Then they'll risk BUSTING their LEGS, KNEECAPS, or even their NECKS to get away as fast as possible.
This TREEHOUSE is now about as secure as you're gonna make it without professional BOOBY-TRAP GEAR, which worries you a little.
..But then you remember an IMPORTANT FACT: The real BOOBY TRAPS are in the MINDS you FREAK along the way.