I'm not new to rabbits, I just started breeding them, but I know how to breed because I've done it before.
My kits come into my house until they are old enough to live outside (depends on the weather) so I'm not worried about not breeding during the winter. Also, I breed my rabbits one day, wait 12 days, palpate them, and re-breed them if they are not pregnant. This way I don't breed a pregnant doe, which can kill both litters and the doe.
All mine are pedigree and pure breed lionheads. I have "so many" because they are dwarfs and only have 2-5 kits per litter and I don't want to over breed them.
As for the cages, I would never think of putting them in a cage where they can't turn around. My cages are quite spacious, I just would like for them to have a run so they have a change of scenery and more room to roam. The stacked cages are what breeders use so you can have more cages in a smaller space; one on the top the other as opposed to them all needing their own spot.
I do know a rabbit vet, one of mine is seeing him currently.
The lionhead's glory is it's mane, when they are put together in cages they will chew on eachother's manes. It's best to keep them separate. Also if one gets sick it doesn't get any of it's cage mates sick.
Breeding rabbits isn't a business for me, it's a passion.
Thank you for your concern, I will make sure I'm taking care of them to the best of my ability.