If you're serious, then seriously research.
Spring for the book, "Storey's book of Raising Rabbits" and don't rely on posts on a site like this. Go to Amazon. You will lose time money and rabbits if you don't study the subject. In fact even if you do study you will still lose some rabbits and misdirect some of your money because there is no substitute for the experience but you will save yourself a lot of headache if you do study the subject SERIOUSLY.
I've been raising rabbits for three years and have about 70 or so and our usual summer peak is about 100. We impregnate a doe every week so at 12 weeks we have a litter to process.
You need to have more cages than one if I read your post right. Good pick on the breeds. A mix between two kinds of rabbits is not a hybrid. Babies starting eating feed way before they're weaned. Weaning should be at 8 weeks not 6 since you are saving money in feed the longer they nurse and putting more size on them.
Rabbits need 16 percent PROTEIN feed at least. I sometimes use 18 and presently with prices on all feeds going up a bit the price has been the same so I'm opting for the 18% as long as the price is the same.
Each doe needs her own cage and the bucks need their own cages. The side walls (cage walls) should be no bigger than 2" by 2" or you will have babies fall out. I use 1" by 2". The mesh on the floor should be 1/2" by 1" unless you really like cleaning out the poop in the corners of the more common 1/2" by 1/2" floors.
Best cage material supplier I've found is here.
They need a piece of plywood on the floors. They do end up getting poopy so you should have a couple at least for each cage so you can rotate in the clean boards. This protects the pads on their feet as all cage floor mesh will mess up their feet in time. Can kill the rabbit since they will waste away and poop all over themselves because it hurts to much to move around.
We use "14 guage, galvanized after" metal cage material for everything now. If you use less it will break down. The best we could come up with was 16 guage locally so that's all I originally used but then found these guys and have real solid cages.
It cost me $300 to make six cages 2' by 4' but they will last for years. I made the bottoms and the roof with the 1/2" by 1" so down the road I can turn the cages upside down since there is no wear on the "roof" side of the cage.
Prior to that I was making cages from fencing materials and they all need to be replaced. Chicken wire will not last long either. Don't waste your time on that.
Rabbits like a piece of hardwood, alder, maple, apple, etc... to chew on to keep their teeth shorter.
Another thing, at eight weeks they're not very big. Though I kill rabbits, chickens and goats, I hate killing but turn on the ol' farmer switch and get to the business of doing it. At eight weeks they were still too much like babies to me. We do them at 12 to 14 weeks. They put on a lot of size by then.
One of the things the rabbit book DID NOT MENTION was how young CAN THEY BREED. Sure, optimum ages were mentioned (six to 8 months depending on size of breed, larger rabbits = older at time of breeding). They can start getting pregnant at around 15-16 weeks. This can cause inbred babies to be born on the bottom of the cage and die as what happened to us ONCE. We didn't know that if you see a doe carrying hay in their mouth it means she's about to have babies. VERY IMPORTANT sign to look for. Use a calender. We've had many many litters and EACH ONE has ALWAYS arrived on the 31st day with no exceptions.
Caging them in an outdoor fence (with no cage) will not work since they will dig. I suppose if you had a temporary holding area to let them come out and frolic and you were going to be right there that would be cool but they can't LIVE THERE.
My superior skill in catching rabbits goes hand in hand with my earlier lack of skill in building and maintaining cages. We've now have it together but are still learning.
I don't believe in wooden cages and all of ours are 100% wire and suspended in a barn. If you do opt for plastic I suspect they will eventually chew it up. I use re-bar on the bottoms of the cage for reinforcement in an "H" pattern and have two of the re-bar pieces stick out about six inches to attach the wire suspending the cages to. Although subtle and slight the flexation of a cage will eventually cause it to break down so the more rigid it's construction the longer it will last.
At some point you'll need to use a propane torch since hay, poop and hair makes a very tough to remove mess, usually in just one corner of the cages. After we pressure wash the cages we let it dry and then gently torch it. Too much will fry off the zinc in the galvanized coating. A dedicated wisk broom and an ice scraper used frequently will keep things better longer.