Design a Multi-Channel Website: Automatic Updating and Live Stream

*Expert designers only. I need a full site design. There will be up to 20+ users who log into their portions, which I want to be partitioned as Channels with their own Categories etc. The users consist of: -Several Podcast hosts (Need live streams, Calendars) -Video Producers -Professors (Need to imbed .pdf and .ppt/.ppsx etc without user requiring software) -Finance Analysts (editors, need streams of stock prices for Gold, Silver, Platinum, Palladium). -Photographers (Photo of the Day, user uploadable images into automated sliders after administrative approval) The site needs to be designed as close to fully automated as possible. I'd like each user's Channel to feature their current tweets and Facebook posts. I would also like automatic sliders to be produced based off of 'featured images' and 'headlines' etc, and [if checked by an administrator] featured on the primary domain homepage. Since there will Channels within the main domain, I'd like to be able to update the Header logo for each, and color scheme, as well as custom sidebars available for the blog of each Channel. This way we can cater ads to their channel topic, and their unique tweets etc. There may be multiple authors/editors per channel. I have graphics available for the initial design, but will be interested in getting something much more modern produced as they are flat and very 2 dimensional. Finally, when a podcast is live, I would like it to be featured on the primary domain homepage. Once it goes off-air, however, I would like page to return to 'normal' mode. There will be several, static and professional ads to display. This is very complex, and I would like a working prototype/mockup in 2-3 weeks so we can launch by November. If you are professional, I need to see a portfolio or your work before we begin so I can see if I trust you as a designer. I have spent much money several times over and not gotten something I loved yet, and have respent only to be disappointed again. If your mockup satisfies me, you will likely have our business indefinitely when we need logo updates or site adjustments. We want to incorporate a full forum for our collective research as our next project.