For some ideas, here's my van, also a 2005 but a GMC safari, which is really the same thing.
The driver's door without the pucklock.
The passenger and sliding door locked at once.
A view from the back doors. The long side of the van. Fire extinguisher is mandatory. Notice the recessed light above the key machine. The drawers beneath the key machine are full of key blanks.
The same long side seen from the side door, the key machine is just on my right (not seen in picture.) The other drawers are for small locks and parts.
the short side, my work bench. LAB pin kit, number and letter stamps behind it, vise, a pencil holder to keep my follower, tweezers, tru-arc pliers...Another recessed light (only the glow is seen.)
The drawers are to keep other small tools and parts.
Another view of my work bench. I sit on an inverted soda crate that I often use to carry things in to a job site, dual purpose.
The way it looks as I enter from the sliding door. Tool case on the left and one on the floor to the right (only the top can be seen, it's blue.) at the tip of my gloves on the right is a first aid kit, also mandatory.
It is alarmed with a 2 way alarm and has a remote starter that I had professionally installed. All windows have wire mesh, except the front and are lightly tinted. The tint from outside is like a mirror but seems almost clear from inside.
It's carpeted to deaden road noise and it helps with insulating it. The walls and roof are also insulated. it gets cold in the winter here and hot in the summer, so AC is also used and blown to the back with a small 12 volt fan in the front.
110 volt power is supply by an inverter connected to it's own battery. it is isolated from the main starter battery so that I never drain my main but both charge from the alternator.
These pictures are from a couple years ago, since then I added more to it but this should give you a good idea of how to set yours up.
M.