I have this old table that I am planning on cutting up. It's about 4'x3', just to give you an idea of it's size. It's 1" thick. I want to make one cut lengthwise, i.e. a single 4' cut. What is the best way go do this in order to field a reasonably straight edge? I have never cut something this big. I need to make the cut about 1' from the edge. The narrow section will be made into a bench. The other section... Not sure yet. Perhaps a guitar body of some kind! The tools I have available are a circular saw, jig saw, and I can ask a buddy to use his table saw if necessary. Please advise! Thanks.