Bay, 70 x 100 is huge! I agree with FB, size it down. Maybe even cut it in half.
My garden footprint is 32 x 48. This space includes raspberries. In the spring, I'm changing things up. The front half (48 x 16) has been turned into 6 raised beds including one for herbs, and 2 for strawberries/asparagus. I've found that the original 32 x 48 was hard to keep up with, and a lot of food went to waste. The back half has a raspberry bed, The remaining 36 x 16 will have a chicken coop built in the middle, with chicken run/garden space in a 2 year alternating pattern from side to side. Squash will continue to go in HK mound. I planted some veggies in my flower garden this year, and really liked that option.
I'm hoping that by forcing myself to "garden smaller", I will also garden smarter. It's my goal to harvest and use all that I produce, without having any of it rot in the garden. It will be helpful having the chickens right there to clean up the leftovers. Of course, along with downsizing my garden, I'll be downsizing the chicken flock, with the intent of adding a couple ducks. Coop design and stocking density will be such that we can go away for a weekend, and leave them shut in the coop if need be.
An incredible amount of food can be grown even in a 16 x 48 space. More than the two of us will ever eat. There will be plenty to share with family and neighbors. The CP fence provides great opportunity for vining crops, and can even be used to trellis tomatoes.
Have you considered growing green manure crops, or underplanting your veggies with an "intentional" weed? Perhaps white or micro clover? The clovers will fix nitrogen. But... beware... they will also spread. God never intended the soil to be naked. He always clothes it with something: whether it's your veggie crops, fallen leaves, last year's composting vegetative matter, or a crop of weeds. The soil demands to be covered. So...
Re: storing cardboard: I just dump it flat on the ground in an out of the way spot, where I'm hopeful for some weed control. The cardboard gets soaked, which dissolves the sticky on all of the tape. So, when I go back to use the cardboard in the garden, the tape is oh so easy to peel off. As long as I use the cardboard within a year, it does not break down too badly to transport with a wheelbarrow. And mice will not nest in wet cardboard. But, the worms sure will! Only down side to this, IMO: slugs also like wet cardboard. So, I just flick them off when I'm loading my WB. My favorite place to collect cardboard is at an appliance warehouse. But, most recently, I go to the local "Dollar Store". Their truck day is Friday, so I can go on Saturday, and load all the cardboard my car will carry. The boxes are smaller, but that's great for doing the space between my raised beds.
When I'm in "mulch the garden" mode, I am shameless in my pursuit of an easy load of cardboard. At the grocer: I'll snag it off the stock boy's carts before they can take it out back to the dumpster. Then, I have my groceries boxed up, instead of bagged.