This is one of my favorite Y-Wings I moded. The custom turret is made from chopping the barrels off a battleship model gun. The base of the turret was some cut plastic sprue. I find the little details and battle damage really give the model some life.
For those interested. The model kit I used was at the 1:1200 scale. It was called “Waterline sink the Bismarck” by a company called Airfix.
Here is a link to what the kit looks like.