Modern naval ship games have the same issues that you have with ssb - the aircraft carriers are 1/6000, the brown water vessels are 1/2400, and the aircraft are 1/600. And there is no cover on the open ocean.. and since most combat is done with cruise missiles, the ranges on everything is like 300 inches; one missile can sink a ship; fighters can carry nukes - and nukes can destroy whole carrier battlegroups.
I don't have a problem with this because modern naval warfare is actually like this. Star Wars fleet battles from the movies are nothing like real life modern fleet battles. IMHO the rules should try to emulate what is seen on screen rather than reflect the modern world. This would all be moot anyway if the figures were of decent quality. I can always kitbash my own rules of use any number of excellent space battle rules out there to run Star Wars battles. The only problem is the pics I've seen of the ships leaves me with little hope that there is any value to be had here at all.
If I were to use aircraft in a naval game They would be of a larger scale than the ships. This gives a great "forced perspective" look to the table top. It appears that the aircraft are flying high above the ships below. This doesn't really work for a space game though.
I too was looking hard at getting into a naval mini war game lately. I downloaded Mongoose publishings free demo rules for Victory at Sea. The game plays fairly fast and covers a wide range of WWII navies. I actually created a sheet of ship counters which I could print off and then glue on to thick card.
Then I saw that WOTC is coming out with War at Sea. A pre-painted, collectable mini game. Downloaded the free rules and read them over. The game is abstract and doesn't appeal to me but the minis look interesting. The collectable aspect is annoying and the figures are actually quite large (4" for battleships).
So that lead me to check out alternative naval minis. I scoped out 1/2400, 1/3000 and 1/6000 ranges produced by GHQ, Skytrex, Navwar and others.
I think I've decided to make a modest investment a get a handful of GHQ's excellent 1/2400 ships. They are a bit big but the I find the smaller ships hard on the eyes and difficult to identify. I'm gonna get the Graf Spee, Exeter, Ajax and Achilles so I can run the battle of the River Plate and see how it goes from there.