Nice job! Concept: 25/30 - You could have had it in a small battle scene (or added a little fictitious history to add to the concept).
Design & Appearance:40/40 - Very good overall color scheme, gives it the Republic "feel" to it. Also a very good walker design, almost as if it walked out of the Battle of Geonosis!
Originality:29.9/30 - I have never seen anything quite like it except a tri-leg armored transport with the same weapons and "feet" as yours.
Overall: 94.9/100! That's the highest rating I've ever given!!