I'm down in Atlanta, and god do I feel you on the clay! My plan isn't 100% permaculture, but I'm hoping to see some soil improvement by the winter. Here's what I've done thus far:
1) Tilled the first couple of inches of soil and immediately sowed sudan grass, red clover and rye. That ran on its own for a few months.
2) Flagged down the guys trimming trees back from the power lines and had them dump two truckloads of ramial chips on my yard. I inoculated the wood with king stropharia mushrooms and spread it 6 inches thick across the majority of the yard. The mulch is holding in an enormous amount of water, and the sudan grass is already starting to poke back through. I left two spots unmulched - a 10x10 space where I'm letting the sudan grass grow to its full height (10ft) to see what the effect of just the cover crop mix is on the soil and a 10x15 space where I've planted sweet potatoes in amongst the cover crop.
I'm planning to sow some buckwheat in the mulch once I see it starting to break down. That should die back once it gets cooler, and then I can assess whether I've built any soil worth writing home about. There's a large tree in my yard that will be coming out this fall due to unfortunate placement above my sewer line, and that should open up sun for a small orchard and more garden space. I did a few raised beds this summer with the lasagna method for soil building, and while I'm hardly eating a full diet out of it, it supplements things nicely and I may be able to sell some of my excess shiso to some local restaurants. Bugs haven't been a huge issue, I think because everything the bugs would want (tomatoes, squash, etc) is hidden in the explosion of shiso!