Going back and reading Decline's replies in this thread, it appears he did stuff tape in the BB shell and the headtube and taped off the brake posts. Also, it seems he used tape to mask off some racing stripes and then proceeded with the coat(s) of red paint. Perhaps Decline is using the term headset instead of headtube? Either way, the bike will still work. Now if that were a Chris King headset, that would be another story.

Decline, I suggest you go here and read Sheldon Brown's page regarding singlespeeds and visit the Park Tools website here in regards to installing parts on your bike. And, here is MTBR's SSFAQ page again. Read up young man, read up!