This robot looks amazing! I think now you should try to make a regular humanoid robot, but first, a question:
In which version are you playing?
Viewing post in Just some ideas :)
Then have this: https://www.mediafire.com/?2j5xt0i3094ac55
To install it into your world, go to the .minecraft folder, then go to saves, after that, open the world save folder where you want to put this template, there should be a structures folder, but if there isn't, create one by typing "structures" without the quotation marks, after that, go into this world, and type the following command: /give @p structure_block
Then, place the block down, right click it, and press the [D] until it becomes a [L], then, on the top box, type the following word: Robot
After that, press LOAD, then, a boundary will appear where the structure will be generated, then, click LOAD again, and watch the basic template of a humanoid robot being generated!