Please see below recent photos of the model making process. Model template - The files were drawn up on the 'puter then sent to the milling machine for cutting.
Framing the Plexiglass Box - 1/3 Framing the Plexiglass Box - 2/3 Framing the Plexiglass Box - 3/3 Interior View of Plexiglass Box. I have also sealed the interior joints with a bead of silicone to make the frame watertight. I have nightmares that it might explode when it is full of water.
Sanding the clay model: Sanding Detail
Coating the clay pieces with shlack: this will make them waterproof.