Okay. 
I don't have much to show, cause I wanted to build this ship pretty much straight out of the box. Unfortunately, they are old molds and require some clean-up.
For the Wave Motion Gun barrel, the kit had this little cup that came in two pieces. It didn't fit the gun aperture correctly, and had almost no detail. You'll see what I mean when you get to it. It needed some work, because that gun is one of the most iconic parts of that ship.
So I assembled the cup and firmly glued it into the hull. Once it was good and dry, I drilled out the bottom of the barrel/cup, and used a round file to smooth it out and match the edges of the aperture. I then filled the resultant gaps w/ Aves Apoxie Sculpt, and wet sanded it smooth once dry.
After that, I glued lengths of 0.010 x 0.020 strip styrene into the barrel. I didn't use a jig or anything, I just eyeballed it. I glued the four cardinal points first - top, bottom, left and right - then I bisected those spaces, and the resulting spaces again, for a total of 16 strips all relatively equidistant. This was actually kind of difficult, because there's not much room to maneuver inside the hull. Once they were in place, I snipped them down on both ends and sanded them flush.
To cover the hole in the bottom of the barrel, I took a shallow M.S.G./Koto burner nozzle and dropped a Wave O-Bolt into it. The one in the image is the first one I made - I used too much liquid cement and that bubbled up around the edges of the bolt, so I made another w/ less glue and used that. I couldn't get the camera to focus down in the barrel, so I can't show you what it looks like finished.
The image here looks a little rough, but in reality it came out quite well. I painted it w/ Mr Surfacer 1000 to check if it was smooth, and polished it w/ an alcohol dipped q-tip. I'm quite pleased w/ the results. Not like anyone will notice the work once the model is done. 
The bottoms of the turrets are hollow, so I'm using sheet cardstock to block them off. That's a work still in progress.
So that's where I am. Sorry not more pictures. As I said, this was (supposed to be) a quickie build so I didn't really document it.