Yes my cages are the same. Some people might say they are too big! What size is yours? Mine are largely 1200x600mm, and I've built a 'maternity ward' that is 1800x600mm so that there is space for mama with 6-8 little 5 week old babies to still be comfortable.
Your grow outs are the setup in the photo above aye?
I'm growing seed and feeding sprouted grains/ barley and wheat grass as well. Currently using bleach to prevent mould, by the time the seed grows and it's ready to be fed out the bleach has fully broken down (scientifically, bleach breaks down in the presence of sunlight and water.) After a week it's safe to feed with no presence of bleach there. They start to grow mould once sprouted if not fed out soon enough.
How much white vinegar to seed do you use? Can you use apple cider vinegar instead? We get some ants and little fruit flies attracted to vinegar, so I'm a bit hesitant as it will probably become a fabulous breeding area for any bugs... And rabbits aren't meat eating bug eating omnivores! Or at least mine are herbivores 
Regarding pellets, it would depend hugely on what you have available. Another breeder and myself joined together and both consistently buy enough pellets from an independent feed store that they now make a pellet specially to have all the things that we asked for. (Actually it's more the other breeder that dealt with that part, because she is closer to the feed store than I am.) That pellet has become standard lines that the feed store now stocks, but it's fully natural and everything we want in a pellet. I have no qualms about feeding it, it's everything they'd get in the wild compacted into a pellet.
