I have used them in conjunction with a small skiff...mostly for stillwater trout fishing. The Scots call them a drogue. We fished mostly higland lochs where the wind would blow you right off the water without one and the drift sock worked like a charm.
Ours was basically a mesh bag about 3.5 feet wide and 5 feet deep. You could probably make one yourself but the key will be constructing it in a manner that keeps the "mouth" of the bag open and controlling your drift. Dont know if there would be safety considerations, etc but I'm sure you've thought of that