This step-down hip system is no longer very popular as it requires many different truss profiles to be made.
The 'flying rafter' hip system show in figure 11c has the manufacturing advantage of there being only one basic hip truss profile. All of the hip trusses, including those forming the girder are similar, and the mono-pitch trusses supported off the girder usually have the same profile as the sloped part of the hip trusses which speeds up fabrication.
The rafters of the mono-pitched trusses are site cut to sit against the upper hip board and the off-cuts are nailed in position to the rafters of the hip trusses. The flat parts of the top chords of the hip trusses and girder are well braced together to prevent instability.
While the hipped corner infill is shown as prefabricated rafter-joist components (open jacks), it is usually cheaper to site fabricate in these areas. The lower hip board is typically notched and supported off a 50 x 50mm post nailed to the girder truss. The upper hip board can be supported off ledgers and in some cases is propped off the hip trusses underneath.
The system offers the advantage of continuous rafters and consequently easily constructed smooth roof slopes. On long spans it may be necessary to use a second hip girder between the apex and monos.