I used the TW Customization tool to come up with 14.6 grams at 26 inches, 2.7 grams at 25 inches and 28.6 grams at 0.8 inches. Since this is nothing like what Djokovic does to his frames, it's safe to say that the hairpin in his pro stock is lighter than that of the retail frame. So you'd need to start with a pro stock frame and get the lead and silicone right. Sounds like a lot of work.
4 x IG Prestige MP, 70 cm, 376 grams, 386 SW, ALU Power @50