This block could range in size from 8 inches to 12 inches. 16 HST units are used for each block. (thus, making your half sq. triangles each 2.5 inches raw edge to raw edge would result in a finished Red & White Cross block that is 8" sewn. A 3.5" HST would yield a 12" sewn finished block.
For review of making HST's in quick methods, see the Half Square Triangles article here. By counting how many combinations you need of each pair of fabrics you can "gang up" your HST's for faster sewing.
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