I decided I should update this really, as I need to catalogue my progress for the 3rd year FMP.
So, yeah, as I said, the previous idea was shot down, as it would have been just a technical show piece which, while it would have been fine, wouldn't have got a lot of marks due to it being lacking story-wise.
My current idea for my FMP (which my teacher has said yes to, so... Whoo!) is something of a mix of Noir, Rashomon, and Star Wars: A Clone Wars:-
Two detectives respond to a report of a theft in a bungalow in the suburbs. They enter and the two posits their theory on the theft, with a simple reveal that the woman (Kathleen) had merely misplaced it.
...So yeah, the two submissions are my WIP for Kathleen and Victor, the woman who reported the Burglary and the Lead Detective on the case.