There are so many variables in those joints
. Like Nick my mind is blown.







The thin ribs are glued to the platen so they don't fall over. The ribs are scrap 1/2" x 2" particle/chip board and the platen in 3/4" MDF.Looks like your cauls are around 1/2” thick, at first I looked at them and thought that’s a good idea as they will be easier to make than my much thicker ones, then I imagined them falling over at glue up time. Difficult to see on the pic have you fastened them to a bit of ply?
It’s a useful way of making a large platten.