Crashing Vue?
You don't say how many figures are you using, but at 350mb it's going to be an awkward file anyway. And does the file render without Toon Pro?
If it is Toon Pro causing the problems email Eric Winemiller at:
ewinemiller@digitalcarversguild.com
Eric has always been helpful when I've emailed him with any DCG plug-in crashes or problems.

Or, can you render your image out in groups or layers (foreground, middle, background)?
And then using the alpha channel options and masks for photoshop files put it all together in an image editor  like photoshop, paint shop pro, gimp etc. I did that in my last Carrara image (Canyon Racers) . That approach reduces the strain on rendering and speeds up render times too.Thats the only thing I can think of.