WillowRun 6-3
Boeing have done their darnedest to make this impossible.
Firstly, the 787-10 fuselage sections are too long to be transported to Seattle: the -10 was only ever designed to have its final assembly in North Charleston, South Carolina.
Secondly, Boeing has sold off the DreamLifter arrival / unloading / materials storage facility in Seattle (to UPS or Fedex IIRC) to make sure there's no way to actually get the 787 major sub-assemblies to a FAL in Seattle