Great job. If you want it to look more realistic I would suggest the following:
- Add driving lights to front
-The logo on the side and back appears to be the old "rural ambulance Victoria" logo and not the current "ambulance Victoria" lgo
- there appears to an extra box on the roof it should only be the air con unit
- AV ambulances have a 4 digit vehicle ID number on the roof, in metro Melbourne they start with a 6. e.g. 6123
The membership number on the side should not say ambulance service next to it. I believe it should says "ambulance membership" you might want to confirm this
Otherwise great job. Well done.