its cool, but it seems a little unoriginal. Nicknames can't be forced, you gotta let them happen.
My first car (92 sho) was named the grocery getter, by one of my friends after we beat a kid in a riced out civic. he said "this four door grocery getter just smoked your **** pot".
My second car(94probe gts) had a terrible name but it will forever be "the anal probe." And again it was named by one of my friends.
My Gt now is the "Green monster", named by a die hard red sox fan after they beat my beloved yankees in the alcs two years ago.
my point is that you will know what your cars nickname is when it happens. Unfortunately it isn't always what you want it to be.