Where to begin? Layout of bedroom studio

Hi everyone, Being a newbee, I am feeling a bit overwhelmed. However, I've done a ton of reading here, on SAE and at Ethan Winer's sites, but advice is always welcome. First off, where I should place the mixing position?? The ceilings are 8' high. I have a neighbor above me, but none around me, so floating a ceiling will be a must. I would love to fill the existing walls with rockwool, but that would require taking down the sheetrock, filling, and re-sheetrocking. Which I'm not opposed to, but maybe it wouldn't be as beneficial as simply building John's side wall absorbers. Especially if the landlord is snooping around! I'm also planning on laying parquet flooring in the center of the room, with about 2' of carpeting between the hardwood floor and the walls. My first thought is to put myself facing wall D, and build the corner absorbers in the areas to the sides of the window. There would also be a loveseat couch along wall B in this scenario. I could then build a reeely small vocal booth in the closet. I chose this option since the closet takes up a large amount of space, and 12 feet becomes the longest distance for mixing from front to back. Anything I am missing? Ideas and considerations would be greatly appreciated. It's going to be a long project.. Gobo

One thing you're missing is the concept of asking your landlord before modifying HIS property - this can get you in a law suit unless you know where the landlord buried his wife after hacking her body to bits with a cleaver... Without doing construction, you'll not get any useful isolation from the upstairs - even WITH construction, it can be a 2-way pain in the ass. Footfall noise almost has to be treated from the above room, in the form of floating flooring (not the studio kind) with thick carpet over it. From below, you're limited to extra layers of drywall over existing ceiling (WITH the landlord's permission, and an engineer's statement that the ceiling joists will hold the extra weight) - beyond that, you would need to remove the ceiling panels and find out exactly what's there; then, if possible add isolators like resilient channel or RSIC clips and hat channel, more insulation, and double drywall layers, everything caulked thoroughly with non-hardening acoustic caulk. Not sure what else to tell you... Steve