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Variations to the basic design are varied, such as:

Some of the energy produced, or some dedicated DSC panels installed within the structure could be used to convert water to hydrogen. The hydrogen could then be burned inside the SCAF to increase the temperature, increasing the draft effect and filtering more air.
Construction over subterrainean parking to both increase draft effect and provide ventilation for the parking.
Over train or subway tunnels to take advantage of the air pushed ahead of the train, a one way valve would need to be installed to stop the air being sucked backward as the train passes.
Along sections of the centre strip of highways. These SCAFs could be cheaply extended by adding black pipes exiting from the two ends of the structure and continuing along the centre strip with filtre holes at intervals. The black pipe method could also be used to just filtre the air along a highway with no energy production.
Pipes laid under the road with intakes in the road surface where the traffic stops. This would help to increase the draft of the structure and remove the pollutants at high concentration points. Like this model.
In the larger versions in cooler areas the SCAFs could double as a greenhouse, like this model. with about 40% of the interior space used as a city nursury or rented out to residents to grow vegetables. The interior of the SCAF would be warm, well ventilated with clean air and protected. Water access would need to be provided and an overpass would have to be built to insure safe access. Using the SCAF to grow vegetables would further help to reduce emissions by reducing the need to import produce into the city. A SCAF of the dimensions shown in the model would provide over four thousand square metres of planting space.
Large SCAFs could also house Stirling motors. Using the air entering the structure to cool the cold part of the cycle and parabolic mirror to heat the hot part. By using the air coming in through the filtres to cool the Stirling, the heat is kept in the structure to drive the convection running the wind turbine.
Buildings with glass fronts with windows that don't open could install a second glass/DSC skin on the southern side (Northern hemisphere) of the building with filtres around the base and/or filtred pipes coming from the underground carpark.
Water tanks could be added to stock the day's heat so that the structure can continue functioning into the night. The concrete of many traffic island or round abouts would serve the same purpose.
An advance in concrete manufacture can make a concrete and masonry products, bricks and pavers etc, that absorb CO2 on a large scale. This technology could be incorporated in the outer wall and the base of the structure. Eco-Cement is the product from TecEco which is a Tasmanian manufacturer.