Michael McMaster is a prop builder, and a member of the R2 Builders Club since 2001. At the behest of Star Wars Rebels executive producer Dave Filoni, McMaster constructed a fully articulated, life-size model of the astromech droid character Chopper to promote the animated series. McMaster's final product was built in about eighty-seven days. Chopper would also make appearances on "Rebels Recon" on Starwars.com, and made a brief cameo appearance in Rogue One.
McMaster also built CH-33Z, a mouse droid for The Star Wars Show, and R3-A3 for "Science and Star Wars". Michael continues to do work for Lucasfilm, and most recently worked on the touring Millennium Falcon Experience, which promoted the film Solo a Star Wars Story.