Matrix with Different Header for Rolling Time Periods

[RAdams]

I was given this style of report to duplicate. It's a rolling 6 Month Variance (Current Year vs Previous Year) and the last Current 6 weeks of sales. Below is a screnshot of the Header style to follow.

I assumed I would use a SummarizedColumn table but not sure how I'd go about making this work. 

Has anyone come across this or have suggestions on how to create this? Like I said, it's rolling so next month will start in February etc. 

Thanks!

[parry2k]

@RAdams interesting question, it surely can be taken care by creating datatable using DAX. if it was only month or week then it was easily achieveable by measure since there are two different granularities, I believe it has to be a datatable. If you can provide sample data  in excel using onedrive/google drive I will try to solve for it.