Cubrisse is the one doing all the great work, im busy building mine in 3D but trying to teach myself Blender at the same time.
The trick with the costume is that there is 3 versions, the suit the stunt guys wear, the CGI robots and the onset props (these are the ones in the factory they are welding). The photos of the ones from the premiere are the onset props which had no feet in the movie so they are wearing the stunt mans shoes. This is the major tell the feet are quite different on the CGI robots.
Yes, I'll be watching this build with a close eye. Trawling the internet now to get as many pics of the Synth as possible to try and replicate the skeleton of this in case you offer up a set of you works