Look at the quality of build as shown in the pictures.
30k? that interior is worth more than that because it's oem and the quality isn't any higher than usual... for lamborghini.
have you ever seen anyone replicate every little part including rear firewall panels? Someone would have to spend 80k just getting oem interior panels to use in that "build."
People using extreme's kit usually don't have access to any oem interior parts not even g28 parts, you only ever see them using mr2 interior. But there are oem inner door sill covers, seats, column, wheel, pedals, switches, vents, floor/shape, seatbelts, ac, instrument cluster, mirror, etc, etc, etc.
Maybe you're like me with the diablo, I don't know what the car is supposed to look like but when you know exactly what the oem car looks like it's easy to point out if the car is real or not.