Ok, I've been working on a cloaked ship using subobjects, with some success. 
However, I need to repair a phsyical subsystem so it becomes visible again - which is probably impossible  

So what i thought was, you could get a small fighter (well, actually a bomber is neeeded for this), and place a turret 
inside at the exact centre of it.  Sounds stupid, yeah?
But, then you create a new beam weapon with a large black/ v.dark blue warmup glow, which lasts for say 55 seconds, and an incredibly short beam.
So, when you press a button, the internal turret fires in the fighter.  This creates a large black sphere (the warmup) around the fighter for the warm-up time, making it look 'black' - cloaked.
So what do you think?  If this could work, you could create different beams with alternate warm-up glows for different colours of nebula, etc  
