As others have commented, this build is a feast of details. The pipes and tubes, plus its proportions, give it an almost organic feel, which goes well with its back story. I like its single, big eye, which makes it quite inhuman.
This is mind-bogglingly detailed! Not only that, but it looks like you paid real attention to how a droid like this would work. All the parts make sense, and it doesn't take a great stretch of the mind to picture this thing in a university lab in Japan somewhere XD