I Built A Landscape Rake Like Tool

You certainly are very handy!

If I was making a drag from a piece of chain link fence I would use a piece of angle iron or channel iron the width of the fence behind the tractor. I would attach three foot long pieces of chain between the fence and the angle iron. One in the center and one each at the ends of the angle iron. Depending on the width of the fence I would attach two pieces of chain in about a foot or a foot and a half  or even more in from the ends connected together on a clevis to hook to the tractor.  This would keep it directly behind the tractor on any thing you would pull it with.  I would keep the width of the clevis chains on the angle iron  narrow enough so when turning you do not catch the tractor rear tires. I would want the drag back from the tractor at least a foot from the tractor rear tire when the tractor is turned 90º. You can never actually turn 90º when pulling the drag.  If you need to turn sharp it would take a straight chain rather than a clevis where the two chains from the angle iron would connect with a long drawbar on the tractor.  Lay every thing out on the ground behind the tractor before cutting, bolting or welding.  This is how I would go about it knowing that it is not the only way.  

The old horse drags used a wood 2"X 4" rather than angle iron. The new tractor drags used channel iron. A 2"X 4" would be fine using carriage bolts to fasten chain. That might be easier for you.

When I was a kid I turned to short with a spring tooth drag and it was up on the rear tractor tire before I could get stopped. Dad was not happy. I was eight or nine at the time.