So figured it finally was time to build a railing. The main problem with adding a railing wasn't doing the carpentry, that's pretty basic, it's the snow and ice that periodically unloads off the roof during the winter, often burying the deck in 2-3 feet of heavy wet snow. So we'll see how it goes this winter. If the railing survives the gods of snow and ice, we'll add some sort of cable guard system beneath the railing to fill in the space, but still allows the snow to pass through. Or we might be cleaning up a pile of splintered wood in the spring.
So at least now there's a place to set down your beer.