My brother, Dad, and I built it over a weekend. We used these partial instructions: http://bukobot.com/bukobot-assembly-documentation
and had a few extra parts at the end. Searching this forum and a post or two helped with those extras. I think it was just spacers for the limit switches and synchro mesh, and a handful of unmarked pieces that are used for cable management.
Referencing jits build instructions for the V1 would have been very helpful during our build. You can find them here: http://bukobot.com/jitsbuild
I also recommend returning loose items to their original bags until they are needed. Often, we had to look at the bag names to figure out where the parts were supposed to go. You may work on one area and then have to come back to it, once something else is finished.