You're all set then. As long as the kitten has somewhere to go that the dog can't get to - which the gates will ensure. Retrievers are the sort of big soppy (sorry) dog that will be utterly dominated by a feisty kitten. The only problem you'll have is that they're so boisterous when young that the kitten might get fed up - but if he can get away for some peace and quiet it should be fine.
Just hang around when they're together at the start to supervise.