ocean: Take it from me... I've seen *many* of these cars up close in Japan, in fact I just had a look at one last week here in Nishinomiya.
Your car, being located out in the country, is gonna have rust. On top of the obvious mechanical and cosmetic problems. I must admit, when I saw the pics, I thought "oh no... you didn't did you?". I bet the driver/owner of that car raced it regularly, then had a minor accident, then realized that the repair cost is goona approach the total amount he paid for the car (400 - 500,000 yen).
ocean, I know how you must feel, I bought a rough R32 with plans to do it up... but even with my car (better condition) it's still a money waster bar none.
Good luck.