Hi,

I have the potential requirement to build quite a large portal website, which I'd like to tackle with Umbraco if possible.  However, the structure is quite complex so I thought I'd pick the community's brains on the best way to approach it.  Although a completely different subject-matter, it's loosely based on the Basecamp structure where master members have their own 'portal' into which sub-members can log in and access their information.  Here's basically what it needs to do:

1. Allow members to register from the main website (http://www.example.com) making a subscription payment to do so (PayPal Website Payments Pro or some other fully-integrated service).
2. Once registered a user will autaomatically be assigned their own URL, which will be their username e.g. http://www.example.com/masterusername.
3. Members can then create sub-member accounts who can log in at the members URL (http://www.example.com/masterusername).  Sub-members can then log into their portal area, where the URL will be http://www.example.com/masterusername/subusername. ; Ideally, sub-members could have log-ins under different master members, although I realise this could complicate matters somewhat.
4. Members will be able to post projects under each sub-member, and add snippets of information (text and perhaps images) regularly to these projects.
5. The sub-member will then be able to log in and see their projects and all the snippets of text & images under each project.

I'm aware I could use base to create individual document nodes for each member and sub-member etc, but there could be thousands of members, each with many sub-members, each with many projects, each with many snippets of text, so I'm pretty sure the content tree isn't the best approach here.

I guess the first step is to learn how to create a specific URL for each master member, then tackle the sub-members once this is sorted?

Is this feasible though?  Am I better leaving the cosy world of Umbraco and using this project as a learning excercise for MVC, or is it something that could be relatively easily done in Umbraco?

Any pointers much appreciated!  Thanks.