Two models I designed in Blender and had printed at Shapeways.com came in yesterday. The lamp post is designed to hold a standard 3mm round LED and therefore has a removable top cover to make it possible to insert the LED. The post of the lamp is hollow and just wide enough for two twisted 0.9mm outer diameter wires. Unlike the bridge the lamp post is printed in Frosted Ultra Detail which allows for really fine detailing like the rivets on the foot of the post (barely visible on the picture).
If all works out satisfactorily I might offer these models in a Shapeways shop.