  The Dragonfly Spectral Line Mapper is a mosaic telescope comprising 120 Canon
telephoto lenses, based on the design of the Dragonfly Telephoto Array. With a
wide field of view, and the addition of the "Dragonfly Filter-Tilter"
instrumentation holding ultra narrow bandpass filters in front of each lens,
the Dragonfly Spectral Line mapper is optimized for ultra low surface
brightness imaging of visible wavelength line emission. The Dragonfly Spectral
Line Mapper was constructed and commissioned in four phases from March 2022 to
November 2023. During this time, four individual mounts of 30 lenses each were
constructed and commissioned. The commissioning of the telescope included the
deployment of the "Dragonfly StarChaser" which carries out image stabilization
corrections in the telephoto lens, to enable hour-long exposures to be taken.
In addition, we introduced new instrumentation such as a film to cover the
optics to keep the filters clean. Here we describe the updated design of the
complete 120-lens array, and the implementation of the instrumentation
described above. Additionally, we present updated characterization of the
cameras and filter transmission for the full array. Finally, we reflect on the
construction and commissioning process of the complete 120-lens array Dragonfly
Spectral Line Mapper, and remark on the feasibility of a larger 1000-lens
array.
