I'm doing Kurt's Cartoon Dog tutorial, and I've encountered boolean problems. I've tried searching the forum and working with what people have previously said. I ran into issues when combining the head and neck, neck and chest, but managed to get around those.

I can't seem to shake the problems now in trying to union a leg. This seems like a common but tricky problem so I figure it's a question worth asking. I don't think I had keep faces together as I was tweaking stuff, does this mean I should just go back to the NURBS model and start from there again? My file is attached incase anyone wants to take a look.

Also, I tried cutting things in half, and I have a few verts that aren't exactly on the 0 grid line, is there any way to move these to the exact edge to fix overlap, or is that solved later when mirroring and merging verts? Thanks!