You can set the resolution by using the -g parameter. Only if you want on the fly resolution/color depth change should you use a build with the vga driver patch. If you want the best stability I would recommend against using one of the experimental builds.f you want to use that resolution, you're going to have to run a version with the VGA patch.
What do you mean with a complete build? As far as I know there are no other places that provide OSX builds.
What you download from here is a complete build for PPC emulation and it provides all files needed. The openbios included in these builds is the official one. What do you expect from another openbios file?
Is there a reason why you use -cpu G3 and not the default G4?
What exactly happens when you say it crashes or does not start? How far do you get?
Is your OS 9.2 installation also crashing/not starting when you do not use the USB passthrough?
The error you see in the yellowish openbios window about nvram is normal. We all have it
And speed? Well, that depends on your host and subjective experience. Some speed improvements in disk access seem to be developed right now. As is the inclusion of the vga driver in the official source. So we will provide a new build when that enters the official code.