Don't assume it is an easy job. Its not a case of transferring files. If you have a legitimate copy of the game the files are already there. Its a long matter of unlocking them for use in SP and creating brand new scripts. (I assume)

Best posts made by JozefG
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RE: Easy Mod To Create [Misc/Script]
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[VEHICLE][WIP] Nissan Skyline 350GT
Since i've never actually done any modding for GTA yet I have little to no experience. Dont expect this soon. Maybe within the next month if I dont get bored and give up
If any experienced modders want to have a go converting this model its here : http://gamemodels.ru/files/file/928-2003-nissan-skyline-350gt-mkxi-v35/