Are we Stumblin' on a 'Step up from ISO-BOOTH'?

Greetings and Salutaions to the powers that BE, from a humble kowtowing Noob, I've been OCD on all the old forums and am exceedingly stoked on the cornucopia of refined genius and general badassery contained here within. Ive got some stuff figured out from research, but Ive reached an impasses and it is decision time, so I call on Overlords for assistance. Im in Nor-California (1 hour north of SF) in a small artsy town in a commercialy zoned space that is currently being set up for a boutique photography/video/web-pub business. This 1200 s.f. loft style space is composed of one large studio room then a couple of editing suites/rooms in the rear. It is upstairs in an older row brick building a indy print/copy center is below on the ground floor (street front) with relatively quiet business (printers and paper cutters clunking intermittently from 9-5. As this is an old one level building we are the loft with the roof over us. No noisy neighbors to the right or left Outside is minimal oneway street traffic that dies down by 7pm. But an occasional big truck vibes through. Isolation will be required, despite the suite being farthest away from traffic and sandwiched between the two other rooms the kitchen and other web-design suite. This loft has been retrofitted and is solidly suspended with steel girder reinforcement. Our desire is for lighter type recording acoustical music (for guitarists, woodwind, vocalists), V/O for commercial and web, and some basic indy ADR. One of our people is a computer mad genius who is streamlining the recording/mastering process with a top o' line Apollo UAD system that he contends can make the most out of a 'dead room' with need for a minimalist control booth or space. Im aware that may be another post for in the wombat-hole. Anyway, Ive done a lot of research and seem to have been persuaded to the 'room within a room' design, as opposed to dealing with the existing dimensions as is. My questions: Should I go with a room within a room that is basically a rectangle with a certain ideal ratio (the ideal small room Sepmeyer, ratio 1.x1.4x1.39, still seems far from ideal for this space) that best meets with a compromise on resonance frequencies so as to afford the most internal space for the different needs of the studio and then build in slotted walls or some other approach after the rectangular shell is built? OR should I get a suitable a template that has angled walls and ceiling and spend the extra time and go that way? Will it deliver far superior results for this size of space? Basically opening the 36'' door to the suite could go right to the wall of the booth and the door to the booth. This would give exterior dimensions of the booth of 10x8x8' sloping to 9'. It would leave a 4' on outside for the a place to put your jacket. Ha. Its gonna be a little tight. I originally wanted to focus this space as simply a V/O booth. Is pushing its size to maximum the room can accomodate so as to appease the desire for a couple of guitarist to pluck out accompaniment tracks doable? The dimensions of the Suite are 13'2''x8'x8'10''sloping to 9'11'', as the image provides below. Our budget is $1500, probably more when we get to treatment time, Im a precise but apprentice level builder, ill be doing the work. I have a roll of about 60'x4'x1/16'' thick of MLV to throw into the booth. The suite has carpet. I can pull up the carpet if need be, rather not. Again the existing structure is all studded on 16'' centers and sheet-rocked and the sub-floor is probably 5/8'' to 1'' ply on 6'' joists. It seems the u-boat floating floor thing is a bit of mass delusion for small low budget options such as this. I suppose I would build a subfloor on top of that out of 2x4. I was thinking of MDF laid out on the carpet to the dimensions of the subfloor template. I understand the decoupled wall treatment. Should I decouple a layer of sheetrock off the existing walls all around and then build the internal booth or is that overkill? I can stagger the studs on the internal booth/room with th iso sandwich treatment ie- dual layer sheet rock n' green glue. Im still researching with what to do with the ceiling/roof of the internal booth/room. There is an A/C vent in the ceiling corner over the door which is ideal, and Ill be researching silencing HVAC ducting from there. If I have a foot or so over the booth's ceiling to futz around with that, we'll be living large at some point in the future when hippie-pits belonging to wannabe folk stars start to stink up in the heat of battle. We have control over the switch, so it can be turned off as needed until then. I closing, the primary question is reiterated: Is it best just to build the rectangular properly isolated room within a room of said dimensions and then deal with built in corners of an advanced formula or design; OR get a well thought out template composed of complex specific angled corners avoiding the 'parallelarealm' I have been conditioned to fear? Damn. That is a lot. Ok, sorry to drone, but I think I covered everything. Thank the gods for the breadth of knowledge and advice I have garnered here already. Im a video/photo guy. Ill be happy to trade any info insight savior of this endeavor for potential catastrophe. I know my stuff in that realm. Here Im merely a builder and a partner to the pen-pushers of this enterprise. Again, a million Thanks, JBH PS Donation on the way!

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