What small pieces are you worried about specifically? The vents on the side? Small parts in a pep build are deceptive, they can be simple, with practice. If you're planning on building your helmet last, then by the time you reach it, you may already have enough practice that it won't bother you anymore. I've built two versions of the ODST helm (as well as numerous other Mjolnir helms) and have had no major problems with any of the small parts. Don't get discouraged, build something and have fun! Good luck.