This is a quick project I made on the weekend – we needed a miniature guitar for a doll. The guitar is about 15cm long (including the neck), but you can scale it a bit if you need it smaller or bigger. Just enter a user-defined scale when printing from Adobe Reader.
Here is a box of matches for scale:
The guitar is easy to make, although if you want to have ‘real’ strings on it, you need to be a bit patient with gluing on thin threads. I cut out the sound hole, but honestly I don’t think it’s worth it. Instructions are included with the PDF template.