Nice to see the Ariel back together. A guy up the road from me has one. I've seen him out on it a couple of times. Fascinating engines.
These bikes are rare in usa, most are in uk, never saw one on the road, saw one at cycle show.
Ten years ago there was a project bike on ebay, did not know if parts were availble, bought books, did research
There is a company in uk that has used parts, makes new parts for Ariel, Triumph, bsa.
Years went by this bike appeared on ebay.
I know very little about Ariel but your exhaust looks different [and new?] compared to the bike in the video.
There were lots of changes through the years, same as CB750
1945 Telescopic forks
1949 Aluminum cylinders
1953 Four exhaust pipes, cylinder pairs
1954 SU carb (replace Solex)
1956 Headlight cowl, tool kit on left, big 4.6l oil tank
Video bike is newer then my bike, 53 to 55, four exhaust pipes, standard headlight.