Note: I’ve edited your post to show the image, for some reason it wasn’t showing up
Hmmm, that is a lot of hair loss for a molt. The skin does look healthy underneath though, so it’s perplexing. I know rabbits can look pretty rough when molting, but I’ve never personally seen that much completely bare skin during a molt. Hopefully some others will chime in if they’ve seen molting look this extreme.
Given the large area, I think a vet visit would be good to rule out fungal, bacterial, and parasite infections.
Looking at medirabbit, the closest thing I can find is “Bilateral symmetric alopecia”, which occurred in an unaltered male, which they deemed to be over grooming out of frustration. Other cases are thought to be linked to hormonal imbalance, but not much is known about it. Here’s the article: http://www.medirabbit.com/EN/Skin_diseases/Hormon/Bilateral.htm
Your boy’s pattern doesn’t match exactly, but if your boy isn’t neutered yet that would be my guess (if other infections are ruled out).
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.