Large Laser Cannon

Using a couple of example designs, I came up with this for the large Laser Cannon barrel.

Using the robot body part, 30361, I started building the front part of the cannon.

Then using 1L technic connectors, I connected to pieces together.  The technic pins are for detailing later on.

 Then a long axel to form the basic structure for the extended barrel.

Now several gears and pulleys followed by three 2L technic connectors to form the final body of the cannon barrel.   The small gear at the end is holding it all in place for now.

Built another body for the back end.

Connected the two bodies with an axel and some more gears.

 Built a carriage so that I can change the elevation of the laser cannon.

 Here is another view of the carriage assembly.

Final design for now.  The detailing on the sides is still up for consideration.  Not sure I like it and it seems to be getting in the way of elevating the cannon.  Final effort will be putting an LED at the end.  Running two wires down the barrel will be fun.