The porous fly sheet seemed to be designed to direct all the water that fell on it into the tent, where it collected in the only waterproof component: the groundsheet.
Just unroll it, slide a single flexible pole into place, set up a sleeping mat and sleeping bag inside and you're in business, no groundsheet or pegs required.
Slide your ear from pillow to groundsheet at dusk, and you'll hear strange, intermittent burrowings of bugs, and the imaginary bass of liquid iron below the asthenosphere.