That's not bad. The only problem with this kind of setup is keeping the hutches sanitized. With wire hutches you can burn the hair off with a weed burner and sanitize the wire at the same time. Because of the wood, that method isn't feasible here. Often folks using this kind of setup have good luck at first then they start losing more litters and breeding stock later.
Sanitation is usually the cause.
Use lots of Lysol and clean the hutches and the nest boxes good between litters. I see a little daylight showing through this hutch. Looks like this bunny has been chewing where he shouldn't have been. Oh well, bunnies will do that. Perhaps lining the inside with wire would prevent it or maybe just giving her a piece of wood to chew on would do the trick.