Designer Bulk Packs each feature one of the five different architectural styles represented in the modular system. Each pack contains plans for three specific buildings and all plastic modular parts needed to finish any one of the three. Styrene roof material, clear window material, complete instructions, building plans and painting and weathering tips are included.
 
Steel sash industrial buildings gained popularity early in the 20th Century. Larger windows provide energy conserving light to the workplace while multiple panes of glass supported by steel framework create an open feeling.