They were slightly off access so the alignment and stacking was done using the Geometry manager software which also applied a bitmap mask to the edges and a feathered mask to the lower edge. The end result was a pixel perfect fit at over 250 lux.
The content was run from a pair of brightsign players and all content updates and projector management was managed remotely over a Wifi link . This meant that once the units were physically installed we did not need to access the site which would have been difficult to arrange, but as both projectors and playback were fully automated and any updates could be done remotely the system ran flawlessly without physical intervention for over a month.
The projections were well received and unusually people stopped for some time and watched as the stories of georgian life played out in the windows proving that its not big effects that matter as much as engaging stories told in an artful way.