The body a Orc Basemesh from Peculiar
The armor is a re-sculpt of Easy Alphonse (FMA) by MT
The head is a Space marine helmet series1 by ForgeRunner that re-sculpted

Everything been re-sculpted and had my own stuff added to the point it unrecognizable but felt that I needed to give credit.

I don't like that the Trench Crusade Death Commando is such a unique figure that it would be hard for people to convert one that would look close to what it look like in picture.
Do what you want with it, remix it or what ever. Don't need to give me credit.

It should be the right scale, they look long and lanky like a snake lizardman.

Make sure the chin has supported or it will have a smaller chin when you print.

I didn't include a shoulder armor in case people wanted to used their own.