RE: Area 51 engines
I Like it!! Personally I would make one that covers the line Area Engines, then I would put a tag line under the logo for all advertizing and boxes etc. The logo would be just Area Engines and the graphic of the alien under it for vinyls but the tag line would be on everything else.
That way you have a logo that works for the entire line not just one engine. Under the logo would be the tag line in a different script.
Runs like its from another world
Just a thought