used DVD Decryter to rip the main movies.
I suppose I could have used that also to rip the extras using IFO mode to extract the necessary streams but it was easier to use DVDShrink to rip the extras as it tells you excactly which streams are what.
Once I had all of these I used DIKO to process the movies and all the extras I needed.
Once DIKO completed its task I authored these movies into DVD-Lab Pro beta4 made my own menus and so on.
Then In the extras menu I made I made a Play All button linked to a dummy menu (As in the guide in the link above) Then it was a simple task of using PgcEdit to edit the dummy menus command table and redirect the menu to the first of the extras movie.
Then in turn I edited the command tables of these movies to link to the next movie if the Play All button was pressed.
The whole thing worked a treat and not only was I very pleased with myself

my kids were over the moon too.