What better way to model the year/period planning dimension to attend a agrobusiness company that has season harvests (Apr-Nov) and between harvests (Dec-Mar), and who want to keep the traditional view of the year/semester/quarter/month as well?
Would it not just be simple to build the standard hierarchy.
Then build 2 nodes "First harvest", "Second Harvest" or something like that and put the months under there as Shared Members? or you can simply have those 2 members have member formulas to calculate the correct totals. There is other options but are basic derivates of these 2 approachs.