yes, ive been looking at making one for a while now, just havent had the time.
youll need thin alloy or tin sheet (bunnings), tin snips, a drill and drill bits, pop rivets, and a pop rivet tool.
cut and bend the sheet to size, mark and cut out holes around the edges, place it up against the bumper, mark the holes over on to it, drill holes in bumper, then pop rivet the two together.
done