The 2nd sheet is a japanese service sheet, not the import sheet. Look on torque gt for examples of service sheets on some of their import cars in the "showroom".
With the age of the DC5's now, and depending how long it has been in the country, rust could be an issue, as yours show. The rear arches do need attention before it gets significantly worse.
The lower strut bar in the engine bay between the chassis legs is a bugger for rust, same problem on the ep3, you can see by its design it 2 metal edges that will hold water, and the chassis brace is like a bucket almost and holds dirt and water being flung up from the wheel arches.
As for the rust in the engine bay, I would say that it is a poor example, could indicate either it has lived by the sea, or had the liner removed (allowing a lot of dirt into the engine bay) or just a engine bay that is never cleaned.
Also, look in the rear spare wheel well, lift the carpet, remove the spare wheel, try and look behind the carpet side trim etc to see what the rust is like in the boot from leaking rear light seals letting water in.
If you are seriously considering it, get it up on a ramp and have a proper look underneath before purchasing, and personally I'd run it past a bodyshop to get an idea on costs for the arches etc before purchasing too.