[Jmenschenfresser]

This is an interesting concept. You will have to be careful with two things. Total resources and victory conditions.

I can see that if you don't allocate enough resources per player it may be possible for Player A to destroy Player B's fleets, but Player A won't be able to glass all of Player B's planets. In other words, if a player devotes significant resources to defense, it might be practically impossible for player A, whose given all of his resources to offense, to win.

That is why I mention Victory conditions. With a set game like this it might be fun to set up objectives like most war games. So the object isn't "total domination" but rather a small set of fixed conditions or objects. That would make it easier on you to set up the numbers.

You could use a modified map with starting positions and a few added planets named 30 Points or 60 Points, etc.

Just suggestions.