Help Treating a High ceiling composing studio

[pablo1980]

Hi everybody, I am in need of some help to treat my new scoring/mixing rooms. I have searched but there is far more info on low ceilings and no so much on somewhat high ceilings.

BACKGROUND:
I am renting a space with two rooms that will be converted in a film music composing studio. The big one is where I will be composing, mixing and recording some acoustic instruments. The second room will be used for singers, other instruments and voice overs. I don´t have the hardware to measure the room and having it professionally tested is out of my budget (already slim). I am not very loud.

Rooms are made of brick and mortar, unfinished. The tall ceiling is also unfinished and I can´t modify the basic structure. I will be focusing in the treatment of the composing room at this time. No materials have been purchased since I am waiting to optimize the treatment.

The main issue are the lengths of the walls:

5 meters (lenght) x 4 meters (width) x 5 meters (height) or 16ft. x 13ft. x 16ft. (aprox)

(The right wall is 4.76 meters high, so the ceiling has a small angle)

I believe that those two 5 meter walls will reinforce some room modes. So, I would have to lower the ceiling, don´t I?

Therefore, I have some questions:

1. Can I lower the ceiling by hanging a cloud (or some clouds) made with a wood frame, fabric and Isover fiberglass (I believe is similiar to OC), or the only option I have is to build a ceiling made of drywall?

2. If I go with the cloud route, it should be hard back would that help me with the room modes?

4. At what Height and Angle would you recomend me to build this cloud or ceiling?

5. I have made a sketchup model of the room with some acoustic treatment I had planned. Absortion in the reflection points (to be found out with the mirror), and corner bass trapping (would you recomend superchunk or placing panels at 45°, leaving the paper on the front side?), how does it look?

6. I am planning to build a 1d QRD Difussor at the backwall, would it help in this kind of room?

7. Is all this enough to kill some of the natural reverb and bass problems of such a high ceiling?

I will be posting more questions as they come up. The budget is not fixed yet, but it seems is not very large, I would prefer the cloud route because I can take it away when the lease contract expires.
Thanks everybody
Pablo