I don't think the layout and torch work would take all that long,maybe a couple of hours tops. I would try drilling a pilot hole for the hardy, 1/2" or so then open it up with the torch and finish it with a lot of filing. The horn would take the most time,you can get the basic shape with the torch but it would take a lot of grinding to get it looking good. A 9" grinder can really chew up a lot of material but you'd have to keep it cool and then do the last grinding with a smaller grinder. Not saying this is the best way to tackle it but that would be the way I would do it. If you were selling them for $125 dollars I don't think you would be making much money. I would estimate about 8 or 9 hours or so to make one.