Easiest way to post a fighter design is when you create it, copy the text in the fighter design window. And with no spares, you might as well get rid of the engineering section, that's 150 tons right there.
As for fleets, mine have been designed around 1-2 carriers (when I get them), 3-4 missile ships (only missile launchers), 3-4 PA/Beam ships, and then 2x the total main ships in escorts. And with the new formation rules, I've split 2 out to each 30, 0 & -30 degrees off the main body at 60k km, and 1 scout at each quarter at 100k km.