Sit down with the architect and explain all your issues. You will want to use construction materials, which prohibit the transfer sound into the walls, ceiling and subfloor. From my own experience I would have the roof rafters/trusses designed to receive two layers of 5/8 sheet rock. The floor joist/trusses should also be designed to add Dura Rock to the plywood subfloor material. Dura Rock is a cement-based material, which is used to provide a firm level base for ceramic tile, when installed over wood floors and walls. The material comes in 4X6 sheets and is joined with fiber tape and adhesives. My ideas are only to give you something to think about. Please use a licensed Architect/Contractor and always get a Building Permit.
Your Friendly Building Inspector
Your Friendly Building Inspector