Seriously though it will be the judgement of the potential buyer willing pay. A professional team repairing want labour cost and parts as a factor and that's not even the bill to you yet. Making the vehicle roadshow standards is expensive, because they garner a lot of time a budding buyer wants back in return.
For many here, as long as it solid and can be fettled with and not stored like rare bauble. Value can be £1 to £100,000 because of rarity or just simply scrap and even parts have greater returns of benefit.
Make the vehicle road worthy first, drive it and potentially a fellow fan may offer fair price later on.