Question about Microsoft Surface Book 2

Hi,
Microsoft only sells these 4 versions at the moment, so I assume that this configuration does not exist. This is probably because at such a high sales price, a slightly larger SSD doesn't make much of a difference or plays too close to the frame of the 8GB version, which is why a combination with a small SSD but 16GB RAM was simply dispensed with.
That's why I would go for the 8GB version if I were on a budget, but if money isn't that important or the 16GB RAM is important, I would buy the 512GB version.