This doesn't sound like a big deal to me. It's a lot of work for sure, but assuming your getting paid for this work, it's doable.

A Rackspace cloud server or 2; a CDN for the documents; I prefer to use Google Apps for email / calendar but thats me.

You could try BigBlueButton for the conference call / video or take parts of it and modify it to fit your needs.

Probably looking at 3-6 months of work if you have a decent plan put together and your not waiting on much from the client.