So... is Kousoku Denjin Albegus 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
Three brilliant high school students, Daisaku, Tetsuya, and Hotaru, build impressive robots for a school competition.
Their creations become Earth's only hope when the malevolent Derinja race sets its sights on conquering the planet.
Professor Mizuki, Hotaru's father, transforms the students' robots into a single, powerful fighting machine called Albegas, designed to defend Earth from the invading Derinja.