It would make sense to build on the work already done in standardizing NRHP related photographs. The 300,000 archive images of historic American buildings I uploaded were mapped to Commons categories and NRHP numbers. It's a while back, but you can see an example of semi-automated mapping at https://commons.wikimedia.org/wiki/Commons:Batch_uploading/Library_of_Congress/HABS (I'd generate this using different methods now, at the time this was independent of Wikidata).
NRHP exists on Wikidata, for example https://www.wikidata.org/wiki/Q424679. So this is all at the stage where it can be pulled together with a bit of bot work and a bit of consensus building on how to adapt existing templates, perhaps just a couple of months with the right volunteer team.
Media on Commons for the UK's listed buildings could then easily follow the identical workflow, but considering this has taken at least four years of discussion to date, it's not strategically wise to try to attempt to set a potentially conflicting precedent with the UK data when the US data is at the final stage.
Fae
On 8 June 2016 at 11:03, Charles Matthews charles.r.matthews@ntlworld.com wrote:
Perhaps some thought should be given to how to structure metadata on buildings (and suchlike) on Commons.
Some of us are aware that the advent of Wikidata has led to a reconsideration of Commons from the "structured data" point of view; which is somewhat stalled right now, though the Creator pages have moved ahead. In other words architects yes, buildings no at present.
In any case, while there is a great deal on Commons, there is also much to be done there.
Charles