Well, another talksomething.org forum. Why? How many such attempts were there...
I'm not discouraging you, but I advise you to give up on this "idea" before anything significant has been invested. What you have imagined is nothing new and I would say that it is not necessary. We have seen a lot of similar attempts here, and very few of them are still active.
Certainly forum platforms are not something that has a promising future, so I would advise you to move on. Don't look at the Bitcointalk model, many have failed trying to copy this, even spending significant amounts of money.