what do you mean problems? like its going slower as it gets to the paint fx plants you have there? (i'm assuming they are paint fx)
put your paint fx on a display layer and hide them until the final render if you're happy with them
it will porbbaly put your render time back down to as it was before
or you could alter mental ray and its BSP trees... i forget how to do that though
it looks awesome, the wires are really clean!
that's a "Ch" pronounced as a "K"
Computer skills I should have:
Objective C, C#, Java, MEL. Python, C++, XML, JavaScript, XSLT, HTML, SQL, CSS, FXScript, Clips, SOAR, ActionScript, OpenGL, DirectX
Maya, XSI, Photoshop, AfterEffects, Motion, Illustrator, Flash, Swift3D