Add a bulkhead to the blank side of the panels so the sides match.  
 
 

Now take an oil drum half and using the ridge detail as a guide, cut 1/3 off the end of the drum.
 

Add the cut down drum half to the side of the electrical box that faces out (opposite the Ziploc container).  Glue it over the lower left corner.
 

Now take the half pipe piece from the Manufactorum sprue and glue it right above the drum, forming a long pipe detail.
 
 

Next we'll add the Necromunda bulkhead (if you don't have one, skip ahead a bit).  Start by sawing away the outer flanges from the panel- use the inner flange as a guide for your razor saw to get a nice cut.
 
 
 

Cut the flanges off both sides, and the cut edges smooth. 
 
 
 

Now you can glue the panel in place, next to the pipe added earlier.  Note how the Necromunda bulkhead's built in ladder provides access to the platform above.
 
 
 
 

If you don't have any Necromunda bulkheads, you can use another Cities of Death building panel as shown here.  Glue a ladder next to the building panel to provide access to the platform above.
 
 
 
 

Next, cut down a bendy straw so there's about 3/4" of straight straw above and below the bendy part.  Bend it into a slight S shape as shown here.  Now slot it into the notch in the electrical box, behind the building panel.  Clip the top off level with the top edge of the VHS case.
 
 

Hold the top end against the VHS case and glue in place as shown.  (The end result can be seen in the picture below, on the right side).
 
 

The next pipe will run horizontally along the underside of the VHS case.  Use your standard hole punch to notch out holes for the straw to run into.
 
 
 
 

Cut a straw down to length as pictured here, and extend the bendy portion out by pulling on either end.  
 
 
 
 
 

Slot the straw through the punched holes in the case and glue in place.
 
 
 
 
 
 

Finally, glue one  Eagle bracket per side, to the  edge of the side building panels, near the top and facing towards the Ziploc container.
 
 
 
 
 

Stuff the length of tubing into the space between the electrical box and the Ziploc container.  Try to center it in the middle.  
 
 

Now continue to cut more lengths of tubing and push them in place until you have a satisfactory number of them crammed in there (I put in five).  Note that the tubing near the outer edges will need to be a bit longer than the one in the center, to account for the curvature of the container.  Remember to face the slit in the tubing inward so it is not visible.  Now, add a couple drops of glue to all of the contact points and set it in place with some Baking Soda.
 

A fewBendy straws will add even more detail in here.  Cut the long end of a straw at a slight angle as shown here, with about an inch and a half of length to the bendy part.
 
 

Now hold the angled end against the container and bend the pipe up behind the eagle bracket.  Glue the two ends of the straw to hold it in place.  Reinforce the bond with a bead of superglue and baking soda if needed.
 

You can also run straws down to the ground as shown here.  One or two straws per side should be enough to get that tangled power cable look!
 
 

Now for those plastic clothespins.  Start by seperating the pins into two halves by twisting the ends away from each other and working them out of the spring.
 

To get better contact when gluing (later), use a hobby knife to shave down the ridges on the back of the clothespin (particularly the middle one).  You can sand the back of the pin on a sanding pad for good measure.  (Ignore this step if using wooden pins).
 

Now, using the spring notch on the back of the pin as a guide, saw straight across the pin.
 
 

You should end up with a short piece and a long piece as shown here.
 

Now to glue the pins to the container.   Make sure the more detailed side of the pin is facing outward when you glue them on! Start next to the ladder, working your way around the container as shown..  Start with a short piece, then a long one, alternating as you go.  Hang in there, you're almost done!
 

Keep adding long and short pin pieces until you get to your power cabling on either side.  For extra strength, run a bead of superglue down the sides of the pins and dust them with some baking soda.    
 
 
 
 
 

And that's it!  Place the turret into the VHS case, above the container.  Don't glue it on or else the turret won't turn. 
 
 
 
 
 

Your finished Defense Laser should look something like this.  Now get some paint on it so you can get it into action!