Drum rooms, speaker isolation cabinets and sound proofing

Cheers rock always good to get recomendations, just picked up a copy, inspired me to pick up a couple more books on recording and midi also, will have the perfect opertuninty for some indepth reading pretty soon, so great timeing......

It's not diffusion. Even if it was, that's too close for it to work. That's a scattering arrangement.

What will happen is sound will reflect in different directions. Early reflections give a sense of space and depth. One giant reflection, like that from an entirely untreated wall, will generally be too damaging to the direct signal. In contrast, by breaking up that energy a bit, you'll get more spatial information while minimizing - hopefully - the downsides of energy which is neither diffuse nor absorbed.

Long story short, early reflections are like a bunch of separate taps on a delay - several spaced out and blended in will give you dimension but one large one too close and 50% wet will have an entirely different effect.

The blue area shaded on the plan is where i intend to change my idea, and fill the entire alcove with anything up to 15" if need be, i was hoping on something a little thinner, but wanted to make dual purpose just for practical reasons, making a series of panels i could stack or wheel and move when need be.....so was looking for a happy medium of whats the best option for doing the job of bass trapping the alcove and then as gobos.....if i had to, im happy to just fill the alcove as a giant bass trap and leave it, then build seperate gobos for the other jobs, just two birds one stone thing i was looking at?......and are the other pictures correct in stating what they are?....

More advice pls on my change in direction.........my gobo has turned into a rather more elaborate design now, not a gobo atall ....probably not the best if solely designed for the best sound....but im comming from a few differnt places with what i wanted...one being some isolation and seperation....two being the design on the outside..im very much into the environment of a creative space...so now im i little stumped onto what to fill the inside part of the pannels with....firstly its one inch oak pannels on the outside and 6mm glass......the door also will be one inch oak........i was intending to put one of my 6 inch absorber pannels on the ceiling that can easily be removed....the back wall is concrete and can be lathed and filled with absorption if needed, my guess is theres enough reflections from the glass, so now i should be concentrating on the absorption .....im really only intrested in a tight drum sound.....i am interested to know what the sound will be like....but would probably only play with head phones...but didnt want to have an overly harsh sound to shred my ears...i do have some walnut pannels i have measured up for the inside but thats where i stopped and thought hang on! Am i making an atractive piece of furniture or a drum room...i was getting a little carred away with the woodwork!......so any advice from drummers and audio experts would be loverly! Cheers!....i will attatch some pictures....the measurements are 8' wide across the back 6'6" from front to back 8' high and the angels are 22.5 degrees.........