Great idea! It should be something that's a culmination of your work, maybe something with four defining features symbolising each decade and as an added suggestion having four distinct images on the top, something similar to this as an example of what i mean
http://www.dreamguitars.com/detail/2...t_corset_no_1/ but on an acoustic of course with again each image being something iconic from each decade.
Body wise how about trying something like a Batson guitar?
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"The bad artists imitate, the great artists steal"
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