A cooperative agreement between NASA, North Carolina State University and North Carolina A&T University led to the construction of a full-scale model of the HL-20 PLS for further human factors research on this concept. Students at the universities, with requirements furnished by Langley and guidance from university instructors, designed the research model during their spring 1990 semester with construction following during the summer. The resulting model was used to evaluate human factors such as crew ingress and egress operations, crew volume and habitability arrangements, and visibility requirements for the crew during docking and landing operations.