I have a donor body for a guitar I'm building but it already has holes drilled into it for the pickguard and the one I would like to install doesn't match up. The pickguard cannot be altered to fit it so I was hoping to get some input on wether it would be suitable to use wood filler/putty to fill the holes and then drill some new ones? Also, should this be done as the body is now (fully painted) or should I strip it back?