Use good quality electronet fence around your pens to keep out predators with a tremendous fencer. I want at least 6,000 volts on a predator exclusion fence. 10,000 makes me happy. Even when I only run a couple of pieces of net fence I like a 3 output joule charger minimum.
http://www.premier1supplies.com/detail.php?prod_id=20226&cat_id=53
House the rabbits in pens similar to what you have pictured. I have 3'x4' boxes for individual does with kits until weaning. 1"x2" 14 ga. wire floor, and sides. 16" overall height. People build stupid tall rabbit tractors and waste money, material, and make them too heavy. Only need tall boxes if it is 90-100 degrees F for extended times. Then you need distance from radiant heat from roof material in that case. Plywood ends, wrap arounds, divider, and roof. I kindle in little wood or cardboard boxes on the wire floor, and kits are on the grass and eating by day 10 or 11.
Rabbits rapid dig in a fury of paw action and pull grass upright and eat it. I only feed pasture under the boxes, garden culls and leaf prunes, hand cut/pulled forage from yard and garden growing, and trimmings/peelings from our kitchen.
Famous Virginian says you can't use wire for flooring. Does dig right through our wire floor and pull up grass just fine. Keep you grass as tall as practical without it getting you in trouble with the lawn police or pasture becoming senescent. 6-9" is good with my mix of clovers, blue grass, timothy, fescue, and rye grasses. Broadcast lots of dutch white, medium white or other good growing clovers for your region. Shoot for 30-40% clover minimum. Plantain, rape, kale, etc are your friends.
I used to raise 3,000 finishers a summer on wire bottom crates on pasture. Now we just produces for home consumption. I could meet all of my family's meat needs with our back yard rabbits at 41 degrees latitude, darn hard winters, and hot, humid summers rather easily just kindling from April to September.
I use 3.5' x 8' grow out boxes. 1"x2" 14 ga. wire sides, 2"x2" 14 gauge woven wire fence by Red Brand for dogs is awesome for grow out floors
with at least 1 1/4 lb weaner kits.
http://www.redbrand.com/Products/SpecialtyApplication/YardGardenKennel.aspx
Same 16" height side walls including frame height. I can mix same day or one or two day different litters at 5-6 weeks old no problem up to about 20 head per grow out. If I feed a forage only diet grazing through the bottom and vegetable culls and trim, it takes around 16-17 weeks for feed out. With free choice 16% alfalfa cubes in addition to grazing, can do it in 9-10. I only finish 350-400 pounds or so of dressed boned out rabbit meat per year on a 1/3 acre back yard kindling 4 does 3-4 times between April and September. I usually finish on my own forage only. Only do alfalfa cubes if I get too much deep snow, hard ice to finish the late September kindled rabbits.
Move crates two or three times a day. Try not to come back to same piece in less than 60 days to avoid most parasites. I never worm. I rotate, manage, and cull anyone without resistance.
California x New Zealand heavily linebred and culled works for me. My family trees look like an EKG for a dead man.
You can overseed grazing rape, kale, plantains, etc. I grow good yielding stuff with high yields in succession. Radishes, daikon radishes, rutabagas(swedes), 5' tall grazing kale, sunflowers, milo, millet, etc all work.
Making hay. Cut with lawnmower, rake onto tarp, drag onto hot dry parking area(take inside at night if you have a garage), spread out and fluff until good and dry(less than 15% moisture by microwave/gram scale method)and make mini-bales by hand. Ground stored mulched swedes, daikons, carrots, etc easier to deal in winter and make great finisher feed.
hand hay baler
https://youtu.be/ygRvui8eQL0
Don't have cages in standing water. Put a small board for does and bucks to get on fall, winter, early spring. They can be damp, not drenched. I don't winter kindle. I throw all does into one grower and put on straw bales when it's too deep to pull through snow, and free feed hay and root crops.
Buck lives in a modified dog crate. Wire floor under top half a large dog crate. He's in it year round. It it gets too wet/cold I'll put a box with straw in for him to hop into.
Look up Major Morant's book on google. Rabbits for Profit and Rabbits for Powder. The Morant grazing hutch is a well over century old technology.
Here's the dog crate, buck house. Had a few inches of snow. Buck is living on stockpiled fescue/clover/yard grass and is fit as a fiddle. Shovel snow, drag, repeat. Sucker gained an extra pound this month.
I'll put doe and grow pictures on another post.