wood is good
In this world of instant gratification, if you do not offer a compleat, finished, ready to install set of wood pieces, you will have little success, no matter the price. Then you have shipping/international costs, so I believe that most of the folks on this side of the pond want a plug and play option, at least. I also know that if you offer this product, folks will want the option of customization; different veneers, different sheens of top coat, as well as the options you mentioned. I think that Bela's pricing, from what I remember, was a relative bargain for the quality rendered...As to the value of a core; well there are cores, and there are delaminated bundles of crisps, (I think that's what you call them)...I've done three sets (as winter therapy..), and never paid more than a $100usd for a core set, nor do I think that they are worth much more than that to anyone other than a restoration shop. Rebuilding is tedious and an exercise in patience...
I have designed furniture for thirty-five years... And set-up, cutters, and forms are the major expense going into mfg of coupe wood parts; the parts themselves aren't the most complex of items, its that there is very little room for error, and the finishing has to be near perfect because of the proximity/visibility when riding in a car...And the finish has to be proper for extremes in temperature and humidity...I used to own part of a little company in Thailand, and we looked at doing sets of solid teak, with teak plywood dash parts, since its similar to the French/Italian Walnut used originally,and the durability...Ultimately felt that there was not enough market, but that was ten years ago...
To your question...$1500-2000usd, veneered/finished, ready to install, landed at a US address.
Sorry for so wordy post...