Difficulties during this project:
While the base form of the guitar is pretty simple to create and extrude, once you add a hole it completely messes up your topology giving you a lot of artefacts around the soundhole. To prevent these artefacts and topology issues you actually have to start from the soundhole (Circle) and extract the edges and moving the vertices around until you get your upper guitar body panel.
In this model, there is still a lot of work to do in order to get the detailing right, like the tuners and chords. The textures are also still work in progress.