I have tried to come up with an option for those in need of face shields who do not have access to the hard plastics traditionally used. Both the glasses and visor can use household plastic/cling/saran wrap as the protective barrier. The glasses require no additional parts (other than the plastic wrap), while the visor requires an elastic or string to be attached to the wearer's head.
The minimum configuration can use the glasses or visors and two struts to hold the wrap away from the wearer's face. The maximum configuration includes a stabilizer bar that can be attached to the bottom of the struts for more stability.