So... is Kishin Heidan finished or not?
NO, it is not finished.
Why?
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
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Synopsis
Kishin Heidan takes place in 1941 during World War II, but with a twist: aliens have invaded Earth.
Instead of uniting against this common enemy, the Allied and Axis powers remain locked in conflict.
The only force standing against the alien threat is the Kishin Corps, who pilot giant robots called Kishin, reverse-engineered from alien technology.
A young man named Taishi unexpectedly becomes involved when he's given a mysterious briefcase by his father.
This case contains the control mechanism for one of the Kishin, making Taishi a target for various factions: the Japanese army, the alien invaders, and the Kishin Corps themselves.
Taishi must navigate a dangerous world of spies, armies, and giant robots to survive and protect the device his father entrusted to him.