I am not entirely sure what the Jigsaw routine is, but the guys I have spoken to it say its ok aside fromt he offshore stint. The Cabins in Sumburgh are nice and seem comfortable enough, but the Miller is just a platform with its opffshore issues for people.
The CG routine is 24 on 24 off for a varying number of rotations dependant on hours available. 1pm - 9pm (15 mins readyness) at the hangar, 9pm - 7:30am at home (45mins), 7:30am - 1pm back in hangar (15 mins).
The different shchemes work better or worse for different people, some like the CG way, some like the jigsaw. As with anything in life it depends on your own preference.
As has been said before, there WILL be a requirement for rear crew, not only for new/bigger contracts, but as the aging workforce starts retiring. And please dont go on about the Bond aircrew age, we know they are mostly young-middle aged
.
In short get in touch with the companies, get your CV on file and see what happens, same deal as if you are a pilot.
Good luck