After going through the older map treads, I noticed that a lot of maps have Germany absorb lands and territories in all directions by the beggining of the 20th century. Now I know the map tread isnt subject to the scrutiny that scenarios in the "Before/After 1900" are subject to, but it would appear that people tend to simply treat territories they dont know what to do with as a natural extension to the adjacent Great Power. Although this is true for every Great Power in the map treads, in the case of Germany it can get bizzare at times with it completly consuming places that not even (or only) Hitler wanted to annex or Germanise.
So what Im asking is what would be the absolute plausible limits of Germany before 1900. The PoD can be as far as the beggining of the Völkerwanderung.