/not an expert on copyright and honestly curious
In short, the Command and Conquer trademark is still in use, so EA are legally required to sue you.
The copyright on the art work is fully covered or for the next 50 years (or maybe more).
It doesn't matter if the company doesn't exist anymore (their assets, incl. IP) belong to someone. It doesn't matter if a copyrighted content is not being commerical exploited anymore, it's still copyright.
If this sounds outragous to you, talk to your politicans, read Free Culture by Lessig, talk to a Pirate Party.
http://en.wikipedia.org/wiki/Abandonware#Enforcement_of_copy...
http://www.battle-board.com/minisl/
If they send a cease and desist I guess I'll just take it offline. I don't think there are any damages in my case, but I'd still hate to be sued!
The green arrow on top of the screen. http://screenshots.en.sftcdn.net/en/scrn/22000/22606/crazy-t...
You'll be much better off by starting your own project, instead of cloning a commercial product. Yes, the source code of command and conquer might have been released by EA, but EA still owns the trademaks.
(speaking as someone who as tried recreating a popular turn based strategy game using HTML5..)