hi Robin Imake a template in ,cardboard, cut metal ,front and sides one piece. Using apress put idents into front panel cut holes for rope anchors ,make these anchor indents [these take alot of time if you dont have a jig for the press] bend panels to shape and weld together .Even if you have the gear they are sods to make thats why nobody does them. Iwill be making two in the new year one is for me the other is sold[£320] will
try to remember to take pics
Laurence