Izzat what you wanted Frank Lee to do with his Geo Metro?
Where do you want to go with this? It looks like NURBS, can you do anything with those compared to polygons or .STL tool paths? And I'm curious about the scalloped edge on the side windows. Effect or Artifact? I like the windows overall.
Here's how I designed a similar but highly defined shape. Starting with a subdivided sphere, I stretched one hemisphere by 250%.
Then a similar operation vertically to lower the 'equator' and a flattened bottom.
Finally adrjusted the overall length/width to 2.5 or 4 to 1 fineness ratio.