Is it possible to make a really big map at once?

[VikingII]

I'm making a map for my fun novel, trying many software as Inkarnate in 2D, FlowScape and Wildshape in 3D, all of them with their pros and cons, when suddenly I remember that I'm modder in many fantasy games! Why don't use that awesome tookit to make a map?

 

I know I can reduce the scale of all objects, but before install all again, I need to know if the toolkit can hold such amount of things:

 

-A town more or less 20 houses long x 20 houses wide (more or less will have 400 houses).

-Surrounded farms x5 the size of the town, with less houses but different types of plantations.

-Also water and rivers.

-Need to be in 1 single map (not multiple cells). This is mandatory, to be able to see it at once in the editor, without the necessity to load the game.

 

Would that be possible in some Elder Scrolls editor? (Morrowind, Oblivion or Skyrim, also from other games, as Neverwinter Nights or Dragon Age Origins, or suggest other freely).