Oh man, did I enjoy putting this one together. It took a lot longer than the other cars, but then again, it's a lot longer than my other cars.
The tailgun assembly was fun to do it's just a whole lot of green stuff slapped on and shaped into a nice large mount over the back trunk, from the back window to the gun barrels. I carved a panel line around the back of the tailgun "tube" so that I could paint a ribbon of silver around it to help combine it with the Cadillac's back end.
The waist guns are the least attractive, but took the most work (which is ok; they were needed to complete the full effect of a driving fortress.) I had to take apart the car, build a couple mounts on the separate internal chassis floor plate, drill out the bottom of the assembled guns, set them onto the pivot points, and then reassemble the car while guiding the guns through the windows and without the guns falling off their mounts (The top of the windows now hold the guns down onto their mounts.) It was a lot of work, but it actually wasn't too difficult. Even the reassembly went fairly well, taking only a couple tries.
Thanks to Lasgunpacker for the idea on the mutant nose art! That really accents and completes this whole piece. I think it was going to feel just like another car without it. It wasn't the easiest to paint up (freehand), and it's not the best looking, but it's the best I can do, and I think it's still efffective. (I offset it to make it easier to paint without that gun getting in the way.)