New Build Questions-Acoustics Forum-Acoustic Fields Forum

Hi, thank you for your great channel it has helped me a lot with my existing room. I am now in the planning stage of a new building, which will include a dedicated 2-channel/home theater . After a lot of research, I have come up with interior room dimensions of L7.69 W5.63 H3.89 or L8.63 W6.19 H4.01 (metric), which are not fixed but seem to sit well with various room mode calculators. My target at this stage is primarily to get the best basis I can for a great-sounding room that can be treated cost-effectively. The outside walls will be brick and the inner walls built to accommodate adequate soundproofing and help with the acoustics if possible. I have a few questions that have come up during this process.

1. With risers being necessary, should the height be based from the floor of the lowest or highest level?
2. Should the internal dimensions include panels and other treatments (ie: measured from the interior walls or from the outer edge of panels)?
3. I have planned within this space to have a wall covering approximately two-thirds of the width, located centrally, to place the projector screen. The gap behind (approx 1.2m) would accommodate some equipment, hide wires and include the entrance to the room. Should the room length be made from the projector wall to the back wall or from the far end behind the wall?

I should add there is a space behind the far wall 1.2m wide (not accessible from the Home Theatre) which I believe may be acoustically beneficial.

Thank you for your help.