Need advice on large room design

Doing a major remodel and now have the opportunity of building my audio room using Fibonacci based dimensions.

My room measures 19'3" x18'3" and current ceiling maxes out at about 14 feet.

1) I have the Cardas info on Trapagon room design and have designed a room is approx 19 long and has a wall on the speaker side that is approx 7'10 tall 12 wide. on the wall behind the listener has dimensions of 9'2" tall and 15'3" wide.
2) Walls and ceilings will be 1/2 inch drywall.
3) Cardas design includes sn opening in the ceiling that has a cutout in the ceiling that has insulation covering it and hidden with some type of cloth to dress it up a little.
4) Floors will be good quality carpet.

I am hoping to get some advice on this design and suggestions on other designs that I might use in this large space.