I don't think @Buddahaid is that far along just yet. That's a lot of raw parts to fabricate. It looks like it will be quite a trick to trim down the raw shells and put the body itself together. The design choices made there will influence those overall dimensions. If the same bucks were used for the screen used counterparts, I bet those dimensions varied quite a bit from prop to prop. I'm excited to see how It's done!
The vacuform is pretty thin, do you have to reinforce it internally? This is a really cool prop build, I'm very excited to see it come along.