Hi there!
I read your requirements in very much detail. And honestly, it took me half an hour to map everything out in my head.
I can make the kind of website you want. I have actually made such websites.
All the requirements will be fulfilled. But let me just tell you that Login with Facebook takes a little time, as we have to first get the SSL certificate of the website and then Facebook approves it. So, it will be a little time consuming.
Apart from that, from the Forum, to the premium membership and its benefits, admin panel etc, like in short, EVERYTHING will be done.
Now, I know that it's a huge project and why would you trust someone with no rating here. But please understand that I am new on Freelancer. I have been working with Fiverr for long and I have 5.0 rating over there. I wanted to explore more avenues so therefore, I am here. I want projects and thus, I am charging you very less, even below the average price. I am charging $1600, which is almost the start of what yo are offering.
I am actually really excited about this project because this is the sort of the project I would want to work for.
If we decide to work on it, I'll break these requirements into atomic ones so that we both are clear as to what is required and how it is going to be done.
For me, quality and customer satisfaction are the forte.
Also, I am a graphic designer as well. I can design the T-shirts for you. And the design of the website will be interactive and aesthetically pleasant.