This is basically SFoL 00, but with a different name. The problem with that was in my opinion that you can’t just throw more classes at a format and expect it to be better. Especially if these classes are community throwaways that don’t fulfill a specific need.
As for this game individually, it’s going to have no cohesion, if you just take user submitted classes, because typically they don’t take into account other classes already in the setup. They can’t even for any future classes submitted. It’s like making a cop, where all the scum are godfathers.
You’d be better off refining your original ideas, listening to feedback and pitching that instead of just playing “FoL, but now with some of my own classes.” (That probably needs to pass review anyways)
Or you can just make it a fully different SFoL yourself and design more classes or just post them in GI and hope they roll sometime.