Hey I took your Mafia idea and ran with it a little bit. I turned my lego town of green grocer, Fire brigade, cafe corner and 2 compatiple buildings I designed myself into a 1930's chicago gangland. Two of the cars are from the Indiana jones 7682 set and then I have built several of my own semi based on there design. I just started putting a couple into LDD but lego does not offer a few of the pieces like the side by side seating. But anyhow I love the idea and I will try getting some pics of my designs for you to look at.