Wait, wait, wait, hold up a minute.............
Ok the Klingon moon explodes, two months later the negotiations start for peace between Klingons and Federation.
So when exactly did Chang and his co-horts have the time to build this prototype Bird-of-Prey they used? They couldn't have gotten it built in two months which means they would have had to have been working on it for much longer, but that wouldn't have made sense since there was no reason for the peace summit until after Praxis exploded.