Well, it would depend on whether you are going to add borders or not. Also are you going to do just 2 colors or shades of color. Are you going to make it scrappy with squares and HSTs.
A lot of unknows yet.
Do you or a freind have EQ? If so, that can calculate whatever size you want and how you want to do it.
According to Jan Krentz'sbook there are many ways to make this quilt: templates, precision cutting, HST's, PP, strip piecing, and fusing. Lots of choices here too.
ali