In my experience, the need for a clear and firm handle on the plans, products, and price is essential. Having this understanding before giving the go-ahead to create the final construction documents can’t be over-emphasized.
Trade-offs are part of the process; everyone I’ve ever dealt with makes them. At some point, those marble bath walls are worth sacrificing for the hardwood in the exercise room.
Do I have a comfortable understanding of what I am getting in each of the 26 categories listed?
Once the final documents are created, one last test of the products and pricing is made. This test ensures all products are available, no price increases have occurred, and no details, now on the final architectural plans, affect the price.