A major concern here is the fact that since Shipyards are now attackable one can simply gain slight military superiority and "camp" the enemy and destroy each and every new shipyard they attempt to build so they can never build any new forces and never recover. Previously each planet was an indestructible shipyard unless you defeat it in an invasion which prevented someone from being camped and make it possible to make a comeback. But with the new shipyard system I suspect this strategy would be very exploitable.
They can come up with restrictions such as making it a requirement that the shipyard must be within your own territory before you can attack it. (ie you need to take the nearby planents to extend your territory or have higher culture) but that wouldn't make much sense.
Either way I don't see this new system working out very well. It seems interesting on paper but in practice it's very exploitable.
End of logan0178's quote
Perhaps.
I think that if range is done properly it isn't that big of an issue. In GC2, I have done exactly this strategy but with planets. In fact I do it just like WIllythemailboy says he does in his post above.
In GC2 you start with a base range before upgrades of about 20% of the map. I normally have no trouble getting to the far side of any ones empire in that game. But if the range system isn't so generous, then you just have more strategy here. He can build his shipyards on the far side of his empire, farther away then from his farthest world if he needs to. You can't touch them even if you can camp his worlds.
Also if your ally is getting hammered and he has lost all of his shipyards, you can give him one of yours from a safe distance without giving up a world.
This mechanic adds a whole bunch of good and bad and new thought. Also it doesn't preclude your planets being able to build ships as well. So you could have a single queue on planets like we do now and still have shipyards. It would be worth building them just for the extra queue. Or perhaps planet based shipyards can also be caped for max hull sizes.
Lots of possibilities.
I am eager to try it out, and if it doesn't work we can still doe something about it. 