Looks like a the beginnings of a good little lab there LFP. I am going through a little "reorganization" myself. I have determined that a minimal workbench-like shelf of about 18-20" deep on most walls is more valuable than traditional 30" deep workbenches. I'm replacing my 2 workbenches (32" deep) with one, and two wall mounted "shelves" (18-20" deep). It seems that I get more use out of having horizontal surface to hold tools and projects, rather than truly "working" on the bench. This leaves more floor space in the middle for a movable project assembly/worktable.
Time spent on workbenches and such, I have never felt I wasted. I also scored a bunch of kitchen cabs (uppers and lowers with drawers) that revolutionized my workshop. Pegboard is evil. (JMHO)
Oh, one suggestion. Your long shelf looks like it might sag if loaded right up. If you add a piece running along underneath on edge, (say 1x2) there will be no sag. You probably already thought of that, but, there you go anyway.
Keep up the good work, keep pushing the envelope. It inspires me to keep on trucking too.