I've got nada in the form of resources for splitting time with the kids. Really think about this schedule that W and I have decided on -- I'll try to make it more user-friendly!
Me with kids:
Wednesday, Thursday every week
W with kids:
Monday, Tuesday every week
W and I:
Friday, Saturday, Sunday every OTHER week
With this schedule, we both get every other weekend to GAL, but still have the kids for 2 days on those weeks. Then we have them for 5 days the other week, so we get lots of quality time with them, and get to do fun weekend things with them too.
I know of another couple that alternates weeks like you are thinking about doing, but have the kids stay with the other parent on the Wednesday of that week, so the kids at least have contact with the other parent in the middle of that seven day stretch.
I think that it is mentioned that the alternating week schedule isn't the best for the kids (younger ones in particular, though) because of how long it is before seeing the other parent. For young kids this is not the healthiest, but I would talk to a counselor/child psychologist to get a good explanation for the reasoning here.