I can only read a bit of that article because the scan isn't so good, but the car aparently used a GT-R floopan cut to fit the S30 shell using the multi-link sus that came with it. The car also uses an air-shifter 'box, and the engine is sans-air flow meters using FCon V Pro. Total custom job, but judging by the engine position, I think they left the front dif as is and mounted the engine to line up with the wheel arches.