Turret ring
I was planning on the same thing. Finding an inward facing gear with matching sprocket has proven hard so far. A motorcycle chain and sprocket is my plan.
I have a few steel rings used as barrel hoops they are 1" steel "I" beam bent in a circle and welded 28" inside diameter. One on turret one on hull and ball bearings in between. Should make a good bearing.
Hope they will work and be able to support a turret.
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