Cool ship.
There is a limit to the complexity of a ship, always has been. I doubt it is any different in the ship designer than it is in the game.
I don't know the exact number of jewelry pieces that a single ship can have, but I think it was mentioned once or twice in other threads. But if you have seven rows of components I guess you reached that limit. 
(How many in one row, by the way? Because, it scrolls and I don't think I ever went beyond a single row.)