I have been taking out a lot of rotted interior wood - see my other post on rotted wood. it involves cutting out wood in restricted situations. One tool that has been invaluable is a multitool oscillating tool that have recently been marketed by all toolmakers. I only have the saw attachment, but I am quite impressed by what one can do with it. I am cutting out sections of panels and this tool makes it easy to cut an outline and remove specific parts of the panel. It is much better than a jig saw because it does not require room for the up and down motion of the jigsaw blade. In addition, it makes an excellent electric chisel allowing me to quickly shave away layers of rotted wood down to solid wood.