After few months of hard converting and editing, the car is in a status, where I can say it's FINISHED ! So here's the hard work.
LOD0 Model from Forza 3, ripped by me then I converted it to GTA SA, then I took the lip of an S15 Front Bumper, and edited it to the car's base. Then I took Alegator's 240ZG Fenders and had to remodel/reedit it completely to the car base to make it correctly fit. Then I took Svander's S30 from SLRR and converted the Wangan Spoiler of it, but had to edit it too. Then I scratched a new Front Grill and the Numberplates. Then took my Watanabe 8 Spokes which I made with Endo. Then to the Materials, I puted the 4-type SA Lights, so it has FR,FL,RR and RL. Uses a vehicle.txd texture as reflection, the vehicleenvmap128. Then cuted out the doors of the car model, of couse had to scratch the door sills. So this is pretty much the work which took the time.
Of course this car won't be released in public, it's exclusive for CarbonGear and Kotton Chop Shop ;D
Pics of the car with my ENB Setting