wow, facing the body, hmm. well, i suppose (no harm meant here) when your guitar is as well played as your no. 1, its not so big a deal. i don't have a bigsby on my guild, & its poly, so i wouldn't hesitate to do your method if i needed to. i actually apply the sandpaper to the body, mostly because i know i'm not going to change string gauges & its easily removed if need be.