I have done the following cars in 0.1

Ambulance - Enterable via the back doors.
Enforcer - Enterable via the back doors.
Bus/Coach - Enter by the left door. (Or right)
Tropic - Enterable by the doors left of the stairs
Rhino - Enterable by the back
Rumpo - Enterable via the back doors
Securiar - Enterable via the back doors
Top Fun - Enterable via the back doors
Gang Burrito - Enterable via the back doors
Mr Whoope - Enterable via the desk next to the sign with the ice creams

0.2 Upgrade:

Police Maverick - Enterable by the front doors
Maverick - Enterable by the front doors

Want one to be done? Leave me a comment!