I believe that it's kinda stupid with the lock box and sets through it. You get the 2 carriers and consoles and both ships can be obtained through lobi crystals. However you cannot obtain the attack ship to complete the entire set. What i find annoying as #&?/.
The post are probably in the wrong place, but I couldn't figure out if it was a question worth to take up.
I wouldn't mind to pay either lobi crystals or zens, but just had the chance to get it.