LucyInTheSky

I'm working on a pattern where the center of the block (see 1st picture) looks like that. Each piece gets cut at 3 7/8" square to finish at 3", making that whole piece 6" when it's completely finished.

But, I want the center piece to be a single piece of fabric (see 2nd picture), so rather than doing 4 sets of small HST units (especially since each outside wing will be a different color), I want to make the center into 1 big block. My plan is to do a big square and then cut the little wings into squares, sew them on top, and flip them up (rather than cutting the center center to exactly its size and working with it as a diamond ... I'd rather have a little bit of waste).

So my thinking is that the center square should be cut to 6.5". Does that seem right? Then each wing still gets cut to 3 7/8"... or would it be 3.5"? I think it would be 3.5.... help! Thanks