One way can be...
2/3 mm laser cut steel to shapes, bend them round to suit shape use male and female clamp them together and press them in over something round, drill a few holes to keep them in place then weld holes up.
Another way...
Would be to block with small blocking hammer the tops lines then with a hammer and dolly square top lines, use a small dolly on the bottom of the top line and with chasers and a proper dolly drop the lower line down
I used the same method to make all the lines on the Monaro quarter
Peter
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