71RS..your story is like a repeat of many but at least you have a car in the end. Some over the years have LOST their car or had them vandalised or wrecked.. handed over DOT slips and bills of sale to US shippers only to have some fly by night advertiser who rents a warehouse in Long Bearch for a month or so scam 30-50 cars & by the time the victims are aware it just too late.
But like do be careful of having work done in the US and not declaring it as part of the export cost of the said item, customs is not stupid, one quick inspection and like YOU, they can see a new windscreen or shocks or intake etc, with the dollar good tax is minimal, but the penalty for falsifying the value is not, you don't want to go there - trust me.
There is a good importer up your way, the John Cain guy, I know of many who have used him and his son who runs the US operation and they are "in house" at both ends, unload in Newcastle, do their own cleaning and quote you one price. Worth considering and you go back to looking after your family and your job.
Congratulations on getting the car though, and for writing this up without all the chest beating that goes on, you learned and have helped others learn to.