>But the classes I was in never got into complex shapes and designs like that.
You might want to go through these tutorials
http://home.pct.edu/~jmather/content/DSG322/inventor_surface_tutorials.htm
Attached is a screen capture of the projects my students are working on at this minute.
You will see a couple of guitars in there.
Also a nice rubber ducky coming along (the student actually has it much further along - but is going back and cleaning up the techniques for a more robust model). I pointed this one out as someone here is looking for a model of a turkey. Might consider changing to duck.
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