Is there a limit to how many extras or items you can use on one ship design?

I currently designed a large ship in the likeness of the Star Trek Ambassador Class model. I'm guessing i have 100+ items on it. Now when i go to add functional items,, other pieces start to disappear and i get strange lines or graphic anomlies for every item i add. If  I subtract the newly installed item,,, the old item that disappeared,, returns and any lines that were there are gone. The model in generals looks like crap once everything is on it. (functional & extras)

Is there a fix for this and if so how do i do it?

But better even is there a limit per design for the amount of items you can use?

Thanks,

Al (horseman@safelink.net)