Hello Ady,
Sorry i´m( Ami-7084)
Have you thought about steel frame,
Basically same price per m2 many differences on standards,guarenteed 25 years sound/damp proofed,from scratch key ready in 4 months.
Compared to 10 months -15 months,
Plus you can make any changes through out the build.
We work with an American company also based in Lisbon,
If you need any advise on this can pass on their contacts.
Good luck