So if I understand this correctly, we'll basically confer with you, the GM, about our actions and get the results, and then we can write up our own RP post based on that? 

I like it. It feels very D&Dish, with the qualities of free writing to design our own character reactions. 

The only suggestion I might have is that we PM our story post to you, and you post all of them at once. The rest period posts might be by us individually, but it seems like the action posts should come from the GM, even if the words are our own.