>>6338754>Does this face look easy enough to sculpt for a first time attempt?No, but go for it, you'll get better with every try.
I failed trying to find the pics of someone making a custom Transformers head out of popsicle sticks/wood. But here's someone making a Kakashi head using a similar technique, using an art template. Make a 2D drawing/print, The Kakashi guy used pencil and the clay lifted the pencil off the paper, you could do that or get some calipers to make measurements, or even cut out pieces of the paper as templates to cut out flat pieces of clay for the "helmet" part of the head. If you're using a self hardening epoxy, that limits your sculpting time, try sculpting faces on a flat hard surface that you can cut to fit inside the head, then make the helmet out of flat pieces you can cut.
>>6338927If I remember correctly he's making a larger version(Explorer class?), so maybe some Hydro-Span to enlarge.