an outdoor shelter particularly of the type normally utilized in transit systems constructed of extruded aluminum members . the extruded members include outwardly extending fins each of which is scored along its base line to permit portions thereof to be easily removed for assembly purposes . side walls are assembled by abutting the same against the fins and then utilizing a securing member which is affixed to the body of the extrusion to retain the side wall securely in place and permit side walls of varying thicknesses to be utilized without the necessity of different extrusions therefor . a roofing member is secured in place in a similar manner along with an extruded fascia , the mitered corners of which are rapidly secured together by a simple stamping .