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This may be a dim question, so I apologise. Is the "string method" simply holding the tube to be welded in place instead of using a jig? If so neat idea, although its still a bit of a job to remove the head tube and mitre (if that is the correct word) the cut joints to fit the new tube.
Cranky-
Yes. It was an easy way to hold the head tube in place while tagging it. I am only suggesting this to Sven though, as he seems capable.
There is of course some filing required. But you get mitres from an online generator based on tube sizes and angle. Then you cut and file until headtube is straight and in the preferred angle. That is where patience comes in
Hulsroy
Svend, you seem to have a lot of patience and engineering skills.
May I suggest you get a steel frame of proper quality tube. Maybe a track frame with a cracked headtube or and older touring bike with horisontal dropouts.
Then you replace the headtube (with a cheap Ceeway Cromoly one) using the string method (Patent Pending).
You can buy a disc tab for 10gbp on ebay and build a cheap fixture yourself.
Then all you need is to find a person with tig welding skills and half an hour to put it together..