Hi Steve,
I have not begun my RF yet so cannot speak from experience on this particular part.
But, I have used the following technique many times when I needed to radius some sheet metal.
Find a suitable piece of tubing with the proper radius you are looking for. Clamp the sheet to the tubing and lightly tap the panel around the tube to achieve the curve you are looking for. The distance the panel should overlap prior to tapping depends on the radius. Again you can use the tubing as a guide i.e if you want the radius to cover 90% mark the tube qtr of the way around from the starting point. The tool you use for tapping should have a fairly large surface area. A Slapping handle can be made out of a piece of hard wood. The taps should start just off the line where the panel clamps to the tube, working your your way down the length of the piece. Work it slowly and do not try to complete the radius with the first hit. Practice on some scraps and you will be surprised how easy it is.
I hope this helps.
David