Work on the modular corridor system begins...

First things first. When I began planning my modular corridor system, I had to decide what I really wanted there and how the pieces should fit together.
I knew I wanted to be able to make something like those 3D Space Hulk boards that pop up here and there regurarly. Something like this:

But I knew that at some point I will like to get back to Necromunda - therefore more vertical terrain would be welcome. Something like this:

Or this:

 

What I came up with? This:

Not really impressive, is it? Those are the basic, 'skeleton' pieces for the board made out of - well, you're right: LEGOs. I used the Lego Digital Designer for the planning phase, and then ordered all the needed pieces in large lots of from BrickLink - it's a site where one can buy LEGO pieces for like $0.01-$0.05 apiece (rare elements can be more costly, though - but there are none in here, as you can guess). The basic set of pieces, with which I can cover an area of 50x70cm or similar did cost me around $50 - the same price tag as for the Litko space corridor system.
I am still waiting for the most important element: Technic bricks 1x1, which will allow me to connect the above elements side-to-side with the use of 'friction pins' - but I can already start working on texturing the walls and floors (see the picture below).

But here comes the coolest part - how the elements can be arranged, both side-to-side, and atop of each other:

And here's something more complicated...