I decided to run the front brake lines through the chassis (rather than under or over it), so made up these bosses which will be welded through the front chassis members. These started life as two ugly bits of steel bar
Which were turned down to fit through a 16mm hole:
Then drilled through, and tapped at the ends:
The banjo fittings will be on the inside of the chassis, and run straight into the hard-lines. Neat and not intrusive.
The male fitting will be on the outside and connect directly to the flexible brake lines.