Yeah that spooked me too when I saw it. Apparently the pax seats are 2 inches wider and really comfortable. I was speaking with a guy in engineering the other day and they said that they have setup a cabin layout which is different to the standard one EMB have.
There is no way that I can see CASA approving 1:50 straight out of the factory so they'd have to buy them with an extra crew seat in the cabin. Unless of course they change the CAO by then but I can't see that happening.