"Spatial data base"

Hello guys, I am trying to build a spatial data base, in which I will have a big number of buildings in a Zotero data base, with all their tasks, architect, year, features, etc and its position in latitude and longitude coordinates (real or approximately).

I will connect Zotero with Excel and then with Grasshopper, so I will have one point per building. So the thing is when I look for Spanish architects who built public buildings outside Spain during 1920-1960, I will have points in a worldwide or europeanwide scale.

My questions are:

1, Do you know any similar project? Or an easier workingflow?

2, Is it better to work in a 2D plane or a 3D world ball - and then write a definition to "unroll" the world sphere?

3, Which Grasshopper pluggin should I use? Heron, Ghowl, Sl? Another which works like any GIS?

4, Do you know if there is a Rhino file which the countries - regions are closed curves or surfaces?

Daniel,

Thank you for your time!