There are no pre-built plans. Architects and designers are the ones tasked with developing the plans. Buildings cannot be built without a set of plans. The perimeter boundaries are surveyed. The site plan is created. The dimensions of the building are laid out. All of this is establishing scope and size for the architect or designer, who must stay within those confines. Anything outside of those boundaries will be unacceptable and labeled as poor design.
Cloud architecture and design operate in much the same way. We must establish a set of boundaries to work within. We must identify what is acceptable and what is not. All of our questionings must lead us toward a clear understanding of what leads to success and what leads to failure. It is just like building a house; if I put in a five-car garage, but I don't have room for a kitchen...