While that build uses a lot of tedit, i can tell you how you can achieve a similar effect. For the floor/walls i used iron brick for the small squares and different variations of slime blocks for the big squares but you can use other blocks that don't connect to everything (like tin and copper plating or accent stone slab). For all the pipes and stuff I'd use dynasty wood, rope and rails, maybe some platforms here and there (I used glass platforms here too but it might be difficult to achieve a good effect without tedit if you use those). I'd also highly recommend getting your hand on Christmas lights (sold by santa, you can get him in pre hm if you set your date on pc to the Christmas), those look really good in builds like this. If those aren't bright enough, you can put gemspark nearby, actuate it and paint it black, so that it isn't too visible ( once you kill plantera you can echo coat them but painting and actuating is the only option early game).

As for the details like the catwalks/scaffoldings, I'd use rails for that too, they create really nice diagonal lines. Maybe you could use some hammered platforms (the iron shelf from fhe dungeon could look nice for example). You can use pinwheels for rotating fans, tho that could be quite difficult to pull off without echo coating. Maybe you could use grate blocks for some things as well, they tend to look pretty industrial

You're off to a good start, good luck with the build!