No, thats bang on mate.
The extra 4 are optional on almost all boards currently. Over time they will probably start to require them though.
Aslong as you can get it in with the 4 over hanging, its fine.
A large number of PSUs will allow you to detach the extra 4 pints now anyway.
http://www.motherboards.org/articles/guides/1487_4.html
4th image