Since this is mostly used as a steam-powered turret, could you fix the turret base to make the pipe connections look right?

I can't. I'm not a 3D artist. I made these by kit-bashing a bunch of models I bought together. Without having a good pipe model to work with I can't do it.

It's also not that simple with how these art mods are set up. I provide them for use by other people. Part of my process is that I render them at several different levels of detail. This way other mods could have super huge or tiny versions of the turrets. So even if I had the pipe models they wouldn't look right at different sizes. The closest I could get is using a square base... But I don't have that model.

That's a big shame :(

I'm happy with it. All things considered they look pretty good. They're not space exploration or industrial revolution quality but that's ok.

Apart from the pipe connections they really are.

Which is why I brought it up. They're good enough that it stands out that this one little thing isn't there.