Thanks for the comment and here are my responses:
1. BLOCKING - I read that blocking helps to spread the load between joists? since I plan on storing some stuff on my puny 2x6 ceiling joists, I figured I would install blocking whenever possible.
2. NON-LOAD BEARING WALL - This wall serves as room walls for 2 bedrooms and a bathroom so I will *not* be changing them at all, now or in the future. As far as I can tell, this wall does *not* rest on any type of walls below (it's an open floor living room below).
3. SISTERED JOISTS (scuttle hatch) - All existing ceiling joists from the bedroom #2 side span over the non-load bearing wall but they are not tacked in. As stated in #1, this non-load bearing wall rests on 2x6" joists in my living room with no walls at all, I would like to minimize any loading.
Taking what you said into consideration, I made some changes to my last proposal. What do you think about latest version?
Specifically, I moved the bottom sistered joist K (from my previous drawing) to sit next to a joist coming from bedroom #1 (I). I then drew in (J) which will tie in both joists from bedroom #2 and #1 together. I extended the same concept to the top portion (A & B).
My thought here was to increase the vertical and horizontal rigidity from shortened joists (D & E) by transferring loads to ceiling joists F, G, H & I and also minimize any loading to my non-load bearing wall since it simply rests on 2x6" ceiling joist in my living room below without any stud support.
Ceiling joists A & J will extend at least 4 feet over the load-bearing wall secured by 3/4" ATSM A-325 structural bolts, washers and nuts as well as staggered 16d framing nails.
4. TRIPLED HEADER - based on your comment, I guess I will not be needing this so I eliminated it.
Looking forward to feedback from everyone.
PS. I drew these diagrams on Adobe Fireworks CS5, not from a 3D CAD software.