Just remember a few things......1) you will always be your worst critic. Nothing will be exactly as you see it in your head and be as good as someone else's build (green grass and all). 2) after the suit is fully built, people will be so enamored w/ it, small imperfections will be over looked. 3) who is going to look at your boots at a con and say "hey man, your boots look funny?".
It could just be the angle of the picture but it does look like on the front piece and the top piece that the right is a bit longer than the left. Like what the others have said, try it on the actual shoe/boot you plan to use and It'll look better.