Hey,
He sounds adorable, any pics of him, I love Frenchies?
As for breeding him, really not a good idea if hes from a petshop as you don't know his genetics or family's health background which is a concern with giants. Also, unless hes been shown, you have no idea if hes the creme d'la creme of rabbits and theres no point breeding yet more bunsters with poor conformation/health as the whole point of breeding should be to improve the lines so as the babies are fit and well. Also, with the HUGE numbers in rescue, is there really any point/goal you have in mind? Breeding animals' temperments can become more aggressive if used for breeding, to be honest, youd be better neutering him and getting him a spayed girlfriend in my opinion!