As a veteran of Galciv2, and civ 3,4 and 5, i want to commend you guys ina very very high manner regarding your mechanics for multiplayer with regards to turn.
It's... amazing. I love it. Civ5's hybrid/simulteneous turns made it more a battle of luck/reaction time, whereas GalCiv is still it's usual slow, easy paced self. I know there are complaints about the "slowness" of the multiplayer, but the bottom line is - if players want a faster game, they are playing the wrong game!
The only thing i would suggest is to give a pop-up notification when you're in the design menu that it's you're turn.
Also is there a way to stop the pregen ships from appearing in my designer? I like to design all my ships from scratch, yet every new military tech gives me 5 new ships that i dont want, with boring names! 
Regards,
Psyrus