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@Harry_C
Did a little bit more today, not too sure about the headtube shape as whilst it is ideal for welding/brazing the swan neck join for the spine to it looks quite shit being all uneven. Also the extra metal needed for a nice shallow taper adds a lot of weight, so I think I'm going to turn another tube in the same two even step style as the other but with a much larger step down to the centre section to cut weight down a bit.
Not very good at documenting the process which I'm sure would be more interesting than just finished pictures, must improve on this.
Turning second bearing seat/external features:
One finished headtube:
Set out all headset bits to measure and check:
And an 'assembled things' picture, need a lower sitting bearing cover:
Silver lining is that bearing seats are spot on for the integrated headset!
Next up:
-source some forks to chop up for the rear wheel
-mill the crown plates, press and weld/braze them onto the steerer and machine top face for crown race seat
-source some tubing for the fork legs
-try and find a tapered tube long enough for the spine