Good idea. Innovative. :thumbsup:
It may not look safe, but before I climb atop it I will pound a pair of fence posts into the ground to keep the stack vertical, and use a ratchet strap tiedown to cinch the stack together. I need to work in the area above the pallet stack, and stepladders and extension ladders are not a practical solution or height.
Yes the ratchet tie down would make it pretty much a big square.I like your safety additions. This sounds pretty safe.