I saw the title and thought this was a FW mechanicum plog. I'm now happy it isn't
I'm impressed with the conversion, it looks very good, and is very original. The only thing I can think for you to improve upob is the greenstuff cloth at the back of the model, I think it needs some more folds for it to look like a cloth tabard.
I enjoy kitbashing a lot more than buying the official minis, I will always kitbash when I have the option.
The cloth tabards will be covered in "power cables" like the space marine tech marines, there will be bits of cloth visible underneath and I'll be going over them again once the canvas has hardened.
I've ordered some pewter wire cables because guitar string is a nightmare. it works fine for the little bits I will need it for but that's not very much.