How are the vehicle rules?


I dont have the rule book yet but I'm looking at getting it. I'd like to use the rule system for fairly precise miniatures combat on the order of Necromunda but in the d20 system with all of its character advancement and juicy detail. So how are the vehicle movement and colision rules? Are they precise enough to enable miniature combat sequences, or do the rules gloss over precise vehicle location in favor of a more abstract system like West End Game's Star Wars?

Also, what do you think about the gun rules? Do they work, have a good feel to them, reasonably represent gun fights without getting too bogged down?

Thanks for your opinions.