As better explained by Dale himself in the comment below, Takumi company is not probably suitable just to install an ofuro. Dale is a real carpenter-SENSEI (toryo) and specialized in traditional carpentry and wood joining.
Asking him to install an ofuro would be like a little like … asking Chopin if he gives private piano lessons…! Anyway Dale is very friendly and helpful and I am sure he will introduce you a reliable plumber in the Seattle area.
Of course if you have the plan to build an authentic japanese house, shrine, or cabinet in the Seattle area, do not search any further!