Ok i have a 2005 VZ Crewman and want to update the sound. Now all i can figure is there are just the is a speaker in each door and the head unit will be fun trying to replace if i can do that at all. Has any one here done anything to there crewman sound wise and what are some idea's? and main troubles that i will cross?

You can remove the audio unit and fit a non-genuine one with little probs.
We have tried to address this one recently. With the earlier models: VT, VX, there is a patch harness available form stores like Autobarn. Hopefully this is available for the VY/VZ units as well.
Plug this one into your existing audio unit connector (Blaupunkt) and you have a set of wires colour coded to get started with.
In this scenario run your own speaker wires and fit new speakers to the doors and/or parcel shelf, etc.
Trims are easy to remove when approached carefully.
The new audio unit will come with a cage which you'll need to mount. The remaining hole below the unit can be filled with a couple of options from Autobarn.