Thank you for your well thought out response. However, unfortunately, without massive excavation there is just nothing I can do about the 12' dimension, so that is what I am stuck with.
DOMZ777, that is a great idea about entering onto just regular floor and stepping up to the riser from the aisle. That is what this current plan is based on.
I previously thought I had 8'' ceilings, but when I measured they were 7'6''. Ugh!
Below is my current plan. Please feel free to chime in on speaker placement, or just anything in general.
There will be a 6ft x 10ft Riser for the back row.
The dimensions of the room are unchangeable without excavating my front yard, so this is what I am unfortunately working with.
Will HT seats fit through a 24'' wide door. When I bought them last time I remember they came apart in two pieces, but didn't pay attention as to just how tight of a space they would fit through?