Thanks for a very informative post . Can't wait to see the finished product.
The original Brevex 400 had a swept back bolt handle almost identical to the FN Deluxe/Supreme.
What is the function of the small lug on the bolt behind the extractor in the first pic?
Is the bolt diameter larger than the standard 98 action?
Is the bolt handle integral with the bolt body?
I don't think the owner of this action could have put it in better hands.
Cheers