Bay Window on Townhouse

Hi There,
Has anyone put a brand new bay window on the rear of a townhouse? I am looking for advice on how deep of a projection is practical and rough budget per floor. Reference image attached.

Thank you!

[Hicks04-and-051](//muut.com/u/brownstoner/s1/:brownstoner:e1yW:hicks04and051.jpg.jpg)