OK, Now I'm cleaning up the edges of the mold and am holding it together with some old 5mm machine screws I had:
I left about an inch of overhang where final top piece will be glued to the bottom. Gonna be hard to reach in there and get the glass applied well. Especially if I want to vacuum bag the layup. I'll probably carve out some foam blocks that will fit under the overhang which will apply some compression once I pull the air out of the bag.
Sarah has grown a little dubious of all this work entrenched in my subconscious.