The ST-260 was originally a one-off custom production loosely based on the SI/M-250 in conjunction with Streele, Incorporated's shipyard and a private contractor. Eventually negotiations opened the door to model production for others that desired the new design.

Whereas the SI/M-250 introduced a saucer shape into the classic wedged hull of the PGC Courier, the ST-260 centered the design around the disc and added the wedge to its extremities. The main deck hosts the helm to starboard, a forward galley/lounge with four bunks (this area doubles as a secondary hold), an elaborate captain's suite, medical bay, and a vast engineering/engine room taking up a majority of the stern. An airlock takes up the port side while an atmospheric boarding ramp with a heavy weapon turret takes up the starboard side. Down below is the main hold with access to the landing gear. Turret weapons are mounted in both the dorsal and ventral positions.