Lone Star Models made two resin update sets for the Hawk/Testors 1/48 Me 163B.
The first set is shown below, and included a resin cockpit tub and seat, a plastic armored glass, and a vacformed canopy. Photo found on Ebay.
The second and current set consists of 10 resin pieces. The set includes the following components: one piece cockpit tub, seat, instrument panel, control stick, rudder pedals, wheels, left side gun bay, engine tail pipe, and a vacformed canopy. The LSM website has a photo of the new set.