the blanks (70 x 265mm) for the 24 blades are cut from 3/4 - 8/4 leftovers, ripped on the bandsaw to 6mm and sanded with the drum sander to 4mm.
ring 1 is on top. the socket fits barely through, make the hole wider with a spindle sander.
to screw in the socket you need a small hand, I made a tool from 2" pvc pipe, by heating up one end until the plastic got moldable, then pressed in the socket with the nut down.
assembly is without glue, just friction fit.
Sockets are from IKEA (E26 ~ $15.-)
the size is designed for 1000L LED bulbs, for 1600L I recommend to use socket extensions (OSH).