  This is the construction proposal for the STAR Event Plane Detector (EPD). It
discusses design considerations, simulations, and physics motivations for the
device. It also covers other important details such as connector construction,
cost schedule and radiation hardness of the epoxy. This proposal was submitted
to STAR in May 2016 and approved shortly thereafter. The device was
subsequently constructed and installed into STAR. The design evolved somewhat
between the proposal and final construction, but this document contains useful
details not found elsewhere. A manuscript detailing the device as constructed
has been posted at arXiv:1912.05243.
