It's nice to see someone being interested in the older stuff like Fireman, Mirrorman, Red Baron, Johnny Sokko and His Giant Robot along with all the other stuff with me personally waiting for them to do some kind of revival of one of them, bringing back old monsters and such.
Say, have you heard of Jumborg Ace? That was made around the time of Fireman and Ultraman Taro.
The story being that a race of aliens known as the Gross came to takeover Earth using their four generations of generals beginning with Anti Go-Ne. In response to this, the enemies of the Gross, the Alien Emerald who are a race of Ultra-like beings send down one of their own to fuse with the plane of a young delivery man, giving the young man the ability to turn into Jumborg Ace when in the plane. It ran for about 50 episodes and was cancelled due to lack of funding with a so-called 5th executive meant to appear.
I'd love to see you make a picture of it like you have with a decent amount of other obscure toku shows.