Help needed in this space?!

Hi, I am back! This time after consulting an acoustics specialist, but still didn’t get the answers I was looking for, hence my return to the forum. The objective: To plan a multi-purpose recording facility that offers post production (TV work from ADR, Foley and Sound Design) and band recording capabilities. With regards to recording bands, the facility should incorporate the following acoustically acceptable functionality:  Area for recording a drum kit on loud levels  Area for recording a guitar amp on loud levels (might be the same area as for drums)  Vocal booth Building Characteristics:  Double story building, where the entire ground floor is available for the construction of the facility (Ground floor area in picture).  Based in central Cape Town, South Africa. Great accessibility to clients, but noisy in terms of traffic and wind (hence the moniker “Cape of storms”).  Building shares a dividing wall with the next door neighbor. The top wall on the floor plan picture is the wall shared between the two buildings.  The construction materials are as follows: Floor – Concrete Walls – Plastered brick walls Ceiling – The wooden floor from the first floor act as the ceiling Here is the blueprint of the ground floor: Thicker lines indicate changes in elevation. It is basically step height from the floor. In the picture the thicker lines indicate elevated areas – some are step level and some higher, but none of these areas extend to the ceiling The acoustic specialist made the following recommendations:  That the top-right-hand room (4) be used as the control room, facing the wall on the right-hand side, because this area offers some symmetry (Brick wall to the left(A) and the right(B) of the engineer)  That the small area (5) next to the shower be used as a vocal booth as this area already possesses required acoustic properties. The engineer would also be able to make visual contact with the actor/artist.  He also recommended that area (3) and (4) should be kept as one room and not be divided, but I was hoping to use a glass sliding door to divide the room so that you still have the feeling of an open plan, but still have the functionality of using area (3) as a booth when needed. He said that a sliding door is not a good idea, but did not go into detail or explained why.  I was hoping to use area (2) as a booth (possibly the drum booth) as it is basically a basement (the building is built on a slope). But, the specialist condemned this idea because of ventilation holes that can’t be blocked (But if open opposes soundproofing efforts)  He said that the ceiling is to low to hang a roof, but there must be a way around low ceilings. Note that area (1) isn’t high enough to be used as recording space. I thought I might use this area as storage space. There must be some cost saving ideas for my space. For instancenly treat the wall that is shared by the next-door-neighbours heavily with less treatment on other walls. My budget is +/- R50 000, but can go to R 100 000 MAXIMUM on treatment! This translates to between $6600 and $13 200. I would appreciate any ideas on:  Soundproofing: Dealing with outside noise and noise from the studio to the next door neighbors especially with loud drum and guitar recording.  The best location for the control room.  The best way to divide the room.  Ceiling treatment – little space left for treatment  Possibly combining sound proofing and acoustic treatment initiatives I’m hoping to achieve acceptable standards, and not to achieve the benchmark. All the necessary dimensions are indicated on the drawing, with ceiling heights, heights between the floor and the beams that support the flooring and the elevated areas that doesn't go up to the ceiling... Would really appreciate any help from the forum. Regards Morné