"It requires long clear runs of oak from trunks 6 metres in length and up to 1.2 metres diameter for planking and other longitudinal timbers. They need to be straight-grained and clear of knots."
That's serious hardwood lumber. Not something you get at Home Depot.
Really, ask the French. The Notre Dame rebuilt is finished, and that involved finding big pieces of hardwood. So there are people with recent expertise at this.
But why all this effort to re-create a burial ship?