Good question, though I'd say it only really comes to down to Mosley's totalism and I guess a look into that kind of national-syndicalist element of it. Though even then I'd argue he diverges from other ones quite a bit, especially in how he views himself
I would like to suggest something, and yes, it is a suggestion, not a question...
Going to the point: Totalism is something new, the charter is just released at the beginning of the game, and there was this other mod that played on the fact that fascism is a very disperse and diverse thing, thus you could build your flavour of fascism. My suggestion is that it would be interesting to have a large event chain to decide how totalism will work, like, if it will support national exceptionalism or internationalist cooperation, if women will be integrated, super integrated (with positive actions) or remain the same, if you are going to add X or Y or W in your manifesto, that would be very interesting.