That's probably a $13K US or so list price bass with $3K in top/back wood upgrades. You guys know what the market looks like in Europe better than I do. It's unfortunate that wood upgrades, particularly $1500 for a decorative back laminate, don't hold their value on resale.
I suspect that would be a $3500-$4000 bass in the US with regular wood on it. I would figure $4000 Euros should sell quickly, and the more you ask above that, the longer you wait. There are people willing to pay for the burl, but not everyone will do it.