It is not a turret. The source for the entire mod is included in the mod itself, so it's not really a secret. I draw the nanites as billboards in the world. They are actually sprites, but they are small enough that they don't look too horrible (they just look like a line after all).

Really Sprites ??? i thought you sere using a particle system

Particle system uses sprites as well. They are called billboards.

Well being on mobile due to computer troubles I couldn't really check out the files of your mod. I just guessed at how it works from watching the video you posted, and inferenced based on my understanding of current modding limitations of SE. That is, I know new block classes cannot be made yet, but I figured you had discovered with recent updates how to mix the functions of two existing block classes.

E.G. the targeting and firing of Turrets and the Turret AI, with the welding and building functions of welders. I at least look forward to seeing the workings of it once I can though!