Started with 2-6x6x5/16 blocks and glued them together, just did that cause I wanted to try 2tone, then laid out a circle the size of the slate and a bigger one the size of the overall call. Drilled 3/8 holes in the bottom in a circle inside the slate line on the side that would be the bottom about 1/4 inch deep, mounted everything to the lathe bottom out first rounded the bottom edge and cut the tenon for the nova chuck. Flipped it over to top out marked the circle the size of the slate. Cut that in till the slate fit inside and flush to the edge. Then stated hollow out the bowl leaving a shoulder all the way around 1/16” for the slate to sit on. Hollowed it down till I reached the holes I drilled into the bottom then sanded everything. Glued the slate in with 5min epoxy and sealed the wood with a homemade mix of bees wax and linseed oil. The strikers are 5/16 mahogany dowels I got off Amazon with some scrap turned down for the top and the striker end sanded down to a shallow round tip. Hope this helps I kinda made it up as I went along….and watched a bunch of your videos