That turned out real nice judging by the pictures .
Great job of thinking it through and working with what you got .
Some years ago I worked in a stair shop and our forms where simply a plywood base with length of 2×4 screwed to it and a piece of waxed hardboard fastened to the 2×4 to smooth the the curve .
another trick that I have used over the years to reduce springback is to put dowels in the lamination before it is removed from the form .
If your floor is nice and flat you could use a router sled setup to clean up the faces of the laminations .
Well it’s too late for all this and your way of doing it got the result you were shooting for .
Thanks for the excellent blog series ,I am enjoying it !