I will refrain from my impulse to point out a similar, but more effective build for a guerilla fighter. Feats...darkstalker, craven, twfing chain, if all of that can even be squeezed in. Items: collar of umbral metamorphosis, masterwork tools, skill boosters, blurstike weapon enchant, deadly precision weapon enchant, bracers of murder, warning weapon enchant, eager weapon enchant, scrolls/wands to UMD grease/glitterdust/greater invisibility/knock among others.