Welcome and sorry to see you baby all banged up like that.
Were you not insured? I cannot imagine something of this value that would not be insured. If it's financed, it has to be. Even paying cash, I would not go without collision on something like this. I had my last streetrod insured for $85k. I built it and could do anything on it, but man, I would not go anywhere without insurance.
In the US this would clearly be a total loss as the frame is clearly more than just tweaked a bit.
If it is insured, I agree with the others, the factory is the place to start. I know that several so far have had the upgraded main frames replaced due to the right front upper rail cracks. Even with metal experience, why do it if it's insured and you can get an upgraded frame out of it.
I've watched the How It's Built moving many times and the way they do the ash wood frame for the body work, splicing and cutting the wood to get the correct arch to the sides would be difficult at best. A new body is what I would look at doing.
I'm sure the guys here will steer you to the right places for parts.
Good luck with your repairs.
