Multisite Share Pages ONly

I am trying to setup a website that has one overarching site and 6 subsites with different domain names. What I want is to be able to share the theme and plugins among all seven sites and only have separate pages for each site. From the documentation on multisite setups it seems as though I would need a different set of plugins, etc. for each site as well. Is there a way to just have my user/sites directory contain just user/sites/subsite1/pages instead of an entire copy of the user/ directory inside user/sites/subsite1?

See this topic for ways of sharing any and all assets between sites in multisite.