That wing...I would kill for an aftermarket double wing like that - one that bolts to stock location but actually does something.
It is a little 'over the top' looking, albeit VERY VERY functional.
I'm not too sure how it could not look ridiculous on an other wise stock bodied FiST though.
Now if we could have those box flares but maybe a little less square, and more rounded on the edges, a slightly less protruding diffuser, air dam, dive planes, vents, canards, etc. it would look more like it 'belongs', AND more importantly, be BALANCED aero-wise, front to back.