While it definitely sounds like it could be fun, however, with the way that RA works, how would you make sure new players don't get rolled over by players that have teched up.
No one would happen to have a fully working desert theater for Red Alert 1 now would they? There is a pretty good one at Red Alert Archive but it is missing rivers and shores. (and also trees, but I can take the ones from the Temperate theater if need be)