I was thinking this for a while, i have both games on my ipod touch. I put a time machine Delorean onto the GTA 3 (had to reset my ipod so its not there any more ) and it was great (doors wern't GUI wing...) and i was thinking how would it be possible...
I have been doing little coading with the scripts of this game and have 4 working time machines on GTA San Andreas (One is a taxi ) but no idea how to code mobile devices... Hope someone does it though!