Hello there out a rather small country called: Holland (NL)

[NoHachi]

Where in Rotterdam are you? Do you have your own workplace where you will do this stuff?
Funny that we'll have two CA86's in Rotterdam, a coupe and a hatchback
I can tell you now though that you won't be reaching your power to weight goal. Power is easy from the engine, but needs more work from the 86 (axles, brakes!)
Weight wise.. ours is stripped, has 4kg wheels (most of the mega offset stuff you see is double that) and still came in at 1040kg. All the turbo stuff adds up pretty quick. There might be another 50kg in lightweight bodyparts, but getting below 900kg will be a challenge. Impossible if you plan on installing parts like the heater matrix. Don't believe everything you read on the internet unless you see a photograph of the numbers on the scale.
Still even with 250hp and 1040kg they can be pretty entertaining. ;-)