Very neat story, good luck with the project. The Northwest Motors link was near and dear to my heart as i worked at Northwest for about 5 years, and still know the original owners quite well.
As far as your colour combo, I dont think tan wasa available at the time, only tobacco (possibly). To have a tan interior, you'd have to go to a later square tail light car interior, or spend a serious chunk of $$ having the interior custom recreated by an upholstery shop.
I agree with Jim, would love to see an ongoing blog on this car.
Good luck with it!
Martin