Marketplace - Multi site - Help!

I am mid way through setting up a new market place using the worpress multi-site option and the market place plugin.

But I'm stuck :0(

I want to have rotating products from the various sites on the home page which is using the Network theme template. So basically the front page is a showcase which then leads off to the sellers stores.

Can I do this? If so how and what have I missed? :0)