I think your calculations are slightly off. The display panel size is currently 33.25 x 20.8 cm. The effective display bezels are 1 cm to left and right, about 1.3cm to the bottom and a whopping 2cm on the top. If they just reduce each bezel by 0.6 cm (making 4mm left and right bezels which should be absolutely doable), the panel size jumps to 16.1". Thats within the same display assembly form factor. Assuming leaked resolution of 3072×1920 is correct, that would give us a 227 PPI panel, which incidentally is exactly the PPI of the MacBook Air.
And I don't think that anyone argues that there won't be any changes to the chassis. After all, it's expected to be a redesign.
If there is indeed 1cm on each side, then I stand corrected. According to the official site its supposed to be 34,93cm wide. Minus the 33,25cm that would result in 1,7cm, or 0,85cm per side. So that's 1,5mm less than in your measurements, which explains exactly where the difference between my 2,5 and your 4mm came from
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