this is just to say

If you were to stage the play, how might you depict the Montagues and Capulets to show that they are of similar class status and wealth but also make them recognizably different from each other and show the audience that they are enemies? You can talk about placement on the stage, costuming, props, body language, style of speaking or any other dramatic elements.  

If I personally was directing a play I would depict the Montagues and the Capulets in very different ways to show that they are the same social and wealth statuses.  First off it would depend on if this was taking place in today's society or in the time that the play was written.  If it took place in today's society then I would depict them as extremely wealthy rival Gangs.  Similar to the rivalry between the gangs the Crips and the Bloods they would have their own colors that gang members would wear.  Like the Montagues would wear red and the Capulets would wear blue.  To show they were enemies I would make it so that whenever they saw each other there would be some kind of conflict whether it was verbal or physical.  The Montagues would be more relaxed, fun, and didn't just think about business.  While the Capulets were very serious and cared a lot about business.  With both of them I would make them seem tough and not back down if they were threatened.  For props the Capulets would have a more classy exotic car like a Ferrari or Maserati.  The Montagues would have a more pimped out car with everything custom.  They would both have different styles of talking too.  The capulets would talk more proper while the Montagues would use more slang words.