Yep, it needs the sashing.
I outlined the blocks so you can see how the sashing strips were constructed.
You'd need an ouside sashing border as well to complete the Irish Chain effect.
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Sometimes I just hate EQ -
Assuming you're using 2" patches:
This is the sashing strip - 11 patches, obviously ONLY 2" patch across.
In your case the top and bottom two patches will be your RWB scraps.
Then a 7 unit size (or 14") piece of the white in between.
The cornerstones will also be a scrap.
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Last edited by MTS; 10-13-2012 at 08:38 AM.