That's a long question, but let me just get to the central aspect, which I think is what sort of regions it's based on.
In Germany, they started with the basic principle that each province, each land, would be a region. Therefore, if you had 75 seats in the Bundestag from a particular land, there would be 75 representatives in the Bundestag from that district, and half would be from districts and the other half would be from a list of the entire land.
The New Zealanders basically accepted this principle and applied it to the whole country, which is smaller than most of the German provinces. The Scots decided that there should be regions, even though Scotland is not very big. So there are, I don't remember how many regions, but each one has 16 members, nine elected from the district, and seven from lists.
So I think there has been a bit of a progression in that. What we would do in Canada, given that we're much bigger and the density of the population can vary significantly, is that we should take the Scottish idea. We should base it on regions, but there's no reason that each region has to have the same number of total seats.