Hi Chris
Randy Hunt and I restored his father's 17' rainbow. It did NOT have an outdside stem BUT it did have a small strip on the outside of the stem that is under the canvas. Don't know why. I don't think it's been in the water yet. Randy moved to California in July and I haven't talked to him in a few weeks. The weight was reasonable. Not real heavy. But we used a no.12 canvas as I recall. Randy plans on posting a final post with it on water, so stay tuned.