I'd extend the femur downwards for a bit longer, or it's gonna walk like one of the Time Bandits..;) the long single armbone (sorry, my biological term for it just flew out the window, it's the one above the radius and ulna..;) might be longer, and shorten the forearm correspondingly.
Don't know if it's relevant, but human body proportions are 7 'heads' high, shoulders 1 head each..(from How to draw Comics the Marvel Way..which, except for the lack of talent, I'd do..;) Just a bit more of the foot for adequate traction (but hey, with antigravs and tractor beams, you wouldn't need arms and legs..but that's me..great modelling as always..;)

I wish I'd said that.. The Staircase Wit

anahl nathrak uth vas betude doth yel dyenvey..;)