I'm working at the moment on some very small components and...yes sketchup is not accurate. When I draw some lines, sketchup grabs the lines from different lines,changes lengths,creates some other lines, hides lines.. as it's no able to work with small faces.
Beside that, orbiting or zooming in in small components it's a pain- the clipping/ disappearing objects issue makes i even harder .
Edited :
Sorry guys ! There was a similar thread about accuracy , and i haven't read all the posts above. My post wasn't meant for this thread !