You can build a guitar with just a jigsaw. It will do everything you need to do, it just won't do it as well as a scroll saw or bandsaw. The biggest problem with a jigsaw is that the blade is only fixed at one end. It stays fairly perpendicular when cutting straight, but will get pretty crooked cutting curves, especially in thick materials. If you are going to use a jigsaw, cut well outside your lines and sand-in.
I was playing around with my new welder, and eventually, I did this. That is a 3/16" round attached to a 1/4" flat - a very common joint for a truss rod. It's not beautiful, but it is strong, you can see how I tried to pull it apart. Then I sawed the end off, and you can see it is solid - no slag inclusions, just two pinpricks at the 'corners' of the round. Welding is not as scary as I thought, but it is going to take a lot of practice. My welds seem to be a matter of luck, but my luck is improving.
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