I want to say I'm currently working on a DWR but truthfully it has intimidated me into a state of suspension. I bought the templates from Marti Michell and the instruction book comes with fabric requirements. Here's what it says for a 101" square finished size.
For 64 centers and 144 melons = 6 yards (5.5 m)
For 288 arcs = 8 yards (7.3 m)
For 288 ends = 3/4 yard (70 cm)
For 316 - 324 ends = 7/8 yard (80 cm) You would use this if you are "filling the outer rings" with ends
My quilt pieces will be fussy cut as I'm using specialty fabric. I've photocopied the fabric so I can practice with the most effective cuts. After some false starts, I am making a sampler DWR with scrap material because the curves are killing me. Keep us posted on your progress!