I realize this is rather outdated now, but seeing as people are still commenting here...
I was staring at the design, and have an alternative view on the double reeds for some of you out there:
They're lightning rods.
It would read something like, "The two men acquired two tall poles/reeds. To use the lightning, a wire was run (footed pine) down from the rods. When there were thunderclouds gathering above the pyramid (dome-over-the-triangle glyph), the "chariot" began to race down the side..."
Anyway, excellent clever design!