You don't need the hangar maker to be the builder or to be local. I know there are many steel buildings in your area of WA.
My hangar in Tucson was a Metallic one. Designed in CA, beams welded in Houston, framing, panels and doors/windows shipped from Phoenix and erected by a crew from Sierra Vista. The slab was poured separately by a local home builder who had an empty week slot to a local civil engineers design - who was a local chapter EAA member.
Any of the well know hangar guys can simply ship you the materials along with a design. Your local building code guys can use the engineering supplied with the hangar to define the slab and a local crew experienced in metal structures can follow the plans to erect the building.
A quick internet search comes up with many local erectors.
PS We like Sequim, my wife's late uncle and aunt celebrated their 75th wedding anniversary there. Are you at Sequim Airport with the narrow runway?