But will it be street legal? Doesn't new cars need to have ABS/airbags/tire pressure monitoring, meet emission and crash protection standards and who know what else. So even if Ford made a new Model T, I don't think it will look anything like the old Model T.
I like slides for long term archival. They can be viewed or scanned and you don't have to worry about color conversion. Also they last a long time if stored properly. The color will fade a bit after 50 years, but it's still visible. If you need really long term archival, maybe oil on canvas?