No is correct. This car is NOT a thingie.
So if you talk to someone that was there, they will tell you thingies were built by a group of guys that did not care much for rules and were looking to design their own cars for speed.
Rules? "We had no rules, except the cars had to be no more than 3'' wide/" The excepted max. width at the time.
This all happened between late1965 and late 1968 dipping into early '69 when it all came to an end.
What has happened over the years, as we have tried to define the term thingies it has come to include all cars that were not real 1/1 cars.
So it has included custom show cars or fantasy cars designed by manufactures to catch the eye of a young man walking in to a raceway.
Meanwhile the "pro guys" were on their own path for speed, adding rear spoilers and front dia-planes and then short (at first) side-dams to their Can Am bodies of the period. As the rule makers loosened there grip, these aero add-ons became so effective, they just got bigger. In conjunction with body manufactures that made bodies with down force in mind, so more kick up in the rear, lowered nose and less and less scale details.
This evolution was all going on through out the '60s and '70s until we ended up with what we now know as a Wing car, lets say mid 80s?
So if this body you asked about is 3'' wide and was designed and built in '65-68 then it is a true thingie, but it was not and is not.
It was built for for kids to blast round a rental track without falling off and when they did crash it would get damaged which would have to fixed by the track staff.
My research has led me to come to the conclusion that thingies have nothing in common with wing cars as they were on separate design paths (with different rules restraints) they are the result of a search for an advantage while racing within the rules and AIR management and of course they do not look like 1/1 cars. But that does Not make wing cars thingies.
Save the term thingies for cars that were built from the mentioned time period, or are newly built in that same "no rules" spirit, with air and esthetics in mind.
Class classifications, really should be IMO.
Scale cars.
Thingies.
Production fantasy cars.
Pro cars.
Class, Race cars.
Wing cars.
Dragsters.