Time to make another garden?

Wifey and I have recently lamented that we're having a hard time finding room for all the summer crops we want to grow while keeping the spring crops we still have.

Ideally, we would have more lettuce, spinach, and cabbage than you see in the picture above to go along with snow peas (which never germinated this year).

We want more room for more beans, some experimental stuff (like luffas), more potatoes, more asparagus, more garlic and onions, and strawberries.  The area down the hill doesn't get a whole lot of sunlight and since all those (minus flowers) don't need much sunlight, we figure we're good to go with using that area for this purpose.

To that end, we've been talking about cutting in another garden down the hill from the current one.  This would encompass where the potatoes currently are and allow us to have a separate garden for the cool-weather crops and permanent plantings and dedicate the one up the hill (our current garden) for summer crops and a little bit of cooler weather stuff.

The area that is more or less in the yellow are would be 32' long by 24' wide.  It would avoid being any closer to the septic field than 5'.  The tentative plan is to rent a deturfing machine to cut away the sod there then put down black plastic to cook off any remaining roots for a few months and install the garden in the late summer to use for the fall planting.  The turf may end up being transplanted into the orchard over top of weeds.