No idea what the typical steel setup cost is. There is a minimum but hardly a max. You can spend 5k on a nice frame & fork jig, or $250 of materials and a bit of machining to make dummy wheels and a basic fixture. You can spend 2k on a new TIG welder or $250 for a basic torch kit with tips, hoses and tanks. $300 on tube blocks and files or 6k on a mill, M42 mitre cutters and mitring fixtures. A big surface plate or a smaller C-channel plate. Campag or Xpert tool kit. And etc. Minimum is probably 3k, plus mistakes along the way. For Ti I wouldn't know.