Tonight I started cutting the trapezoid segments for the helix. The helix is a 2.5 turn 30" radius helix at roughly 2% grade.
I wanted to use radius cuts, but the wasted plywood was an issue. I'm using 3/4" cabinet grade (8 ply).
The joints will be glued and kerf jig joint screwed. I've used this system for the valances as well as some furniture I have built. It's very strong and reliable.
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