For practice, i made a pine blank using several pieces of 3"x2" (once planed, more like 2.75"x1.75"). Tried roughing the body shape with a jigsaw, i gave up after a minute.....the jigsaw didnt sound happy and it was reeeeally slow.
I then used a router on the topside until i reached the max depth (only using a 3/4" bit), fixed the template to the underside (like Dylan) and did the same, its only pine so i didnt mind drilling holes all the way through.
I had about 1/4" of wood that the router bit couldnt reach, so i used the jigsaw and cut 1/4" from the body line. While the jigsaw cut fine, i will certainly agree with Drak's 'blade wandering' comment. I cleaned the 'lip' up with a rasp and sanding.
In hindsight.....what a god-awful method!! Talk about unnecessary, innaccurate, hard work. Only reason i posted all that is to illustrate how pointless 'making do' is. I will be buying a much more competant router bit and do all the routing in one go, from the topside. I cant afford a bandsaw, so its either find someone who does or just use the router with shallow passes.
There are plenty of more experienced guys here that have already discouraged the use of 'make-do' methods, but one more couldnt hurt. Im just glad i wasnt stupid enough to try all that out on the good wood first go!