Mac - Love the photos with your feet hanging out.
As for the price, unfortunately I have no idea.
I think most people would agree this is a top end build by someone who know what they are doing.
I think you would need to sell it in Europe to get the vast sums the red Milgia Speedster went for.
There are only a few Cordite/Navigators actually on the road, so maybe the Spitfire donor is worth more than a Herald one?
Obviously I would like to see your car set a nice, high bench mark, as mine will clearly be worth less than yours!
So if you are prepared to wait for a sale, then stick a high price on it and see what happens.
Or maybe take it to a show / event when the warm sunshine has returned.
( Can't remember when you are planning to head overseas. )
Good luck, Paul.