I'd struggle to want to pay even £17,000 for that.
Racing cars gain provenance from use and more importantly wins. This in turn adds value. At the moment, this is a bitsa project and therefore, the 'value' is in the parts and the potential. To reach any potential, large sums of money will need to be spent.
Therefore, at the moment, this is a project and while it could be used as a track/some kind of race car, it would end up being exorbitantly expensive. The owner will need to find someone who wants to take a niche appeal project on and those chances - imho - are slim anywhere near the price point he wants.