The two large sawtooth-roofed buildings which stand on the east side of the Gore Highway, either side of Stephen Street at Harristown in Toowoomba, were built during 1942 as Mechanical Transport Ordnance Stores. This complex was referred to as 3 Advanced Ordnance Depot (3 AOD) by December 1942.

To the east of the northern store building was a workshop area for 6 Advanced Workshop, Australian Electrical and Mechanical Engineers (AEME), and building ‘B’ of the workshops’ complex still exists north of Stephen Street, between the Gore Highway and the Southern Railway line.

A camp site for 3 AOD used to be located by west of the Gore Highway, between Stephen Street in the north, Hampton Street in the west and just south of Stark Court to the south. The camp site for 6 Advanced Workshop AEME was located to the east of the workshops area, between the Southern Railway in the north and Stephen Street in the south, and almost to Fourth Avenue in the east.