Hi Eduardo,
I think this is great! I have a similar project modeling the centre of the town where I live: Leominster (pronounced Lem-ster) Herefordshire, England. Here's the collection so far:
http://sketchup.google.com/3dwarehouse/cldetails?mid=694bdaf197e2aec7bac8d19b776df429
I like the idea that modelers are doing more than the big, well known world cities.
Good work!
Tom