Oops, Polly that article isn't quite finished yet and probably isn't visible to the general public.:lookaround
Just to add a few things, when Polly says that breeding can be a heart ache part of it is because things can go wrong, especially with smaller rabbit breeds because they're more likely to get stuck kits that require a cesarean to save the mom. There's also peanuts and runts who don't thrive (not to mention stillborn babies), uterine infections (a breeder here lost half a litter to that, required surgery and antibiotics for the momand the surviving babies had to be hand raised), mammary infections, 1st time mamas who have the litter out of the nest or hurt/kill them, and sometimes healthy kits get very ill right around weaning and they can't always be saved. If you're going to breed you need to learn what problem signs to look for, what can be done immediately and when you need to run for a vet. And of course having several hundred dollars set aside for an emergency vet visit in the middle of the night.
As someone raising two (eep!) litters from one mama that I'm fostering for a shelter, I would never ever want to breed without having an experienced breeder nearby to help me with problems. Shoot, I'd settle for someone who is good at telling genders on 5 week olds! I and manybreeders here consider a mentor for breeding essential for newbies. A forum and a phonenumber aren't always enough.
Also, please don't let them play together at all unless you are planning to get her pregnant right this moment. You may see him mounting her head, but all it takes is a split second in the right position and she's pregnant. It's also possible for him to impregnate her through the wire- yes it does happen- so it's not a good idea to keep them where can reach the other's cage while playing, or have cages right against each other so that they can touch. Letting rabbits play together is for same-sex rabbits or spayed/neutered bun only.
Not to mention that the last thing we need is more pet rabbits in the system. Check out all the ones being euthanised in Rescue Me because shelters and rescues are full. At least when show breeders breed for standards and show purposes many of the babies will find homes with other show people.