The Cable Building acanthus leaf panel

Now that the Commodore mask is done, I figured out the size of the model I will make for the Cable Building acanthus leaf block, it will start out in the clay master model at 20-1/2″ x 26″ and after shrinking when that’s dry it would wind up about 18-3/4″ x 23-1/2″, but if I make a plaster mold to hand-press clay into those would start out at 18-3/4″ x 23-1/2″ and shrink to about 17-1/2″ x 21″ which I have calculated out in reverse so as to wind up with a dry pressed sculpture that will fit my 18″ x 23″ kiln.
I could make the model a little taller- there’s room, but that would alter the proportions.