Anybody threshing wheat?

We're starting to harvest our 1 acre wheat field and are getting outstanding yields! I expect to see about 100 gallons of wheat harvested this year, which is excellent and above my expectations. Next year we'll do better, as we sowed too thinly in most of the field and I know we could have grown 4 times as much.

Anyway, does anybody have any tips for threshing? What we're doing right now is throwing the wheat onto the (clean) concrete driveway and going over it back and forth with my truck. Then rake away the straw and gather the wheat/chaff for further winnowing.

I am keen on looking at other ideas, especially ideas or plans for building a small scale thresher. Any thoughts from anyone???