I doubt if any of us are expert on Guittarons, but the last two posts make the key points clearly . We all expect well-made and immaculately finished instruments, because these are the standards set by the mass market factories in US, Korea, Japan and China. We expect good luthiers to aspire to these, and to add extra quality that justifies the extra cost. But good and bad are relative , and I guess standards differ in different countries. A luthier in Mexico selling to the local market may have a different perspective. Look at Greek bouzoukis, which vary enormously in their finish quality. Whilst many I'm sure are produced for tourists, others are played. Unfortunately a poor build means less years of useful life, and many Greek zouks simply don't last.
I suspect this Guittaron is an instrument destined for the local market. Sell it as such, and someone may buy it. It's the only guitar-shaped bass instrument that can comfortably hold its own in an acoustic session.
....oops, I spent so long writing this the conversation has moved on. Im sure you are selling honestly.
Good luck with the sale.