This is how you could do it using just Poser:

So it basically just boxes that you scale so they have the correct dimensions and you move them into position. If you use a modelling tools like blender or 3ds max you can do it even faster and weld the boxes together and so forth, but in principle its the same.

Now when you place the camera inside you have to be sure of two things:

1. All your lights use ray tracing for shadow casting, so just go through each light and change those that ain't

2. Make sure that you use a render quality that uses ray tracing in the Firefly render options. (The slider thing, need to be set so there is a check mark in the ray tracing)