Rebuilding wall to neighboring unit

Hello, I originally posted this at another site, but I though I'd repost it here since there seems to be more activity. Setup: Blue is the floor on my side. Brown is a single studded wall (2x4) with only thin veneer wood panels nailed on. 1: has some insulation and wood panels on both sides, I assume. For now, let's assume that I'm not going to pop off the panels on the neighbor's side. The right edge of wall 1 is 14 feet high (sloped ceiling) and the left side is 8 ft high. 4: this is the ceiling to the bedroom, which is about 8 ft high. All the walls below this ceiling appear to have drywall on the bedroom side. Above is attic, and I see exposed studs on all the walls. 3: cut-out for the bedroom closet. Wood panels on the left side, open studs inside the attic, drywall inside the closet. 2: potential source of noise leak. Open studs inside the attic. I omitted a wall in the CAD drawing, but any noise that goes thru this can bounce around in the attic only. For now the potential plan is to pop off all the wooden panels on my side of wall 1, put up drywall, and put the panels back on. Budget/goal The wall right now is thin to the point where I can easily hear the neighbor talking and his TV. The landlord has agreed to pay for the wall to be drywalled, and I would pay any extra to have it done for improved acoustics. My goal is to get as many STC points as possible, while limiting my expended effort to about a weekend, and/or a few hundred dollars. The project breakdown looks like this so far: I get to pop off and re-attach the wood panels Drywall job 5/8" 550 Add RC 175 Drywall in attic (wall 2) 225 Thus my money expenditure would be 400 in this case. Questions 1: I'm not sure if the values in that Canadian study of different walls is totally relevant, since I have a skimpy wall on the neighbor side, so it's a skimpy mass-air-mass system. How would this affect the usefulness of RC, or the effect of adding more mass via using double drywall? 2: As Gullfo suggested, attach slabs of 15" wide drywall between the studs, butted against the neighbor's panels. I'm sure this will help, but how much, and would it be worth my time to do myself, as opposed to adding more mass on my side of the studs? 3: Worth it to get wall 2 drywalled (with RC), or is it not really that much of an issue given that I'm not aiming for that high of an STC anyway? 4: Any other suggestion on how to approach this?

Same people here as there boss. I think that STC points are overrated in the quest for isolation. When you consider the flankingthat is inherent in multi-dwelling structures many of the best modifications Glenn has already explained to you that will improve your situation. If you spend the few minutes it may take to get the idea of mass and or density you will better appreciatte the installation of double sheetrock into the stud spaces. You may also come to understand the priority of decoupling via RC and other methods. While it is not clear that you are on a second floor, it may be so. And if it is so, you have more issues with isolation then you may be ready to digest. Even still, Glenn is of a high caliber in this area and his suggestions should be taken with some authority.