You know where i sit with this one Imperial Fighter ;-)

Though can i throw in the suggestion, the first mock up you posted shows six destroyers on screen, yes, but looks rather random, and as if they are are there for the sake of just being there to sell the shot. I know im being a little to analitical with a rough mock up shot (BTW).

Notice how Han can see that "the fleets beggining to break up" just after, suggesting the stardestroyers follow a flight path of sort, therefore cloning and scaling of any one destroyer (to a degree) would be acceptable, or even needed (i dunno myself really, and is debatable i guess).

For example, i slightly doctored your image to show the armada, with a scence of flying in formation just not totally universal, without being too in your face, if you get my gist!

EDIT) Which sounds totally arse after paying a bit more attention to your second mock up as that sort of gets what i was going at (i got a bit excitable after the first shot, sorry). Though, its interesting that you didnt clone any of the destroyers whatsoever.