I've been spending some time in the home shop working on K-27 cylinder assembly parts. I finished up the two rear steam chest covers that required a lot of lathe and mill work with the angles and triangle cutouts in the side. Here you can see the part on the upper rear of 463's cylinder assembly.
The equivalent part in my build. Note that on the model the two arms are circular vs. the flat surface of the arms on 463. This is for ease of machining vs. a casting on the prototype.
Dave