Built a rear bumper for a 1000-3, started with 1/4 plywood bracket(3 tries) 2x2 "bumper "to test clearance", Cut out 3/16 x 3 flat bar, 1/2" round bar, drilled hole for bar and welded, drilled hole for bolt, added spacer, put 3/4 stock in frame (slid in frame too far PITA to get out) and tack welded, painted, 1 1/4" tube for bolting bumper bar to bracket, welded brackets, finished.