So long as you round the edges and make sure there's no rust or anything hazardous, it shouldn't be an issue. I worked at the PB booth for a few years, so unless the rules have changed, that should be okay! If you'd like, I could confirm that with the SAS PB coordinator for ya. He and I are buds.
Sakuracon 2014 lineup
Marco Bott - SNK
Edward Elric- FMA (with automail)
Rin Okumura- Blue Exorcist
Lavi- D. Gray Man (possible)