I did not know about either of these. Per the Starlog #27 blurb below, Mattel “scrapped” the Command Ship because production cost was too high, specifically the chip required to emulate the Star Bird-like acceleration and laser sounds.
The helmet was supposed to transform a kid’s voice into the voice of a Cylon! Just think: we could have all been talking like Cylons.
Top images are courtesy of By Your Command.
2 Warps to Neptune 
Part of me is glad the Galactica was never released – it would have been another toy I’d have had a cat in hell’s chance of getting my parents to spring for and would have wasted months pointlessly mooning over in the Universal Stores Catalogue, with consequent deleterious effects upon my already compromised academic performance. Holy shit, though, I’d wear that Cylon helmet 24 hours a day!