Update:
Ok I got his arms reversed and he now looks like the back of the box. I noticed right away that now the screws are on the inside, the way the ones on his shoulders are, facing you. When I looked at the box again I noticed I could see the screw holes as well on his left arm, so either the pic on the back of the box is wrong, or the figure itself is wrong, but I got mine switched with no problems and he now looks exactly like the box backing.
for anyone who want to do it themselves it's real easy.
1.) take the three screws in each shoulder out with a small philips head screwdriver and put the screws aside.
2.) holding his entire arm except the shoulder gently wiggle his arm out towards his back. This will remove his arm, the door/window and attached panel.
3.) Don't get em confused.
4.) there's 3 posts that serve as a peg for the arm to swivel on and as the post beds for the screws. Pry his arm up the post away from the inside of the door. Do the same to his other arm and switch them. Be careful since the plastic is clear (window) any stress cracks would show in the window.
5.) Put him back together, just be careful screwing him back together since you're screwing into clear plastic. Nice and snug, don't get all He-Man and crack it by overtightening.
I'm much happier with him this way. I just noticed too that his blades an automorph, I've just been pulling it out. But the green panel on his inside forearm opens up, swivel the hand into his forearm and the blade comes out. *smacks forehead* All this staring at the pic on the back of the box and I didn't notice his left hand is missing.
So I think he looks cooler this way, for some reason, maybe just cuz it bugged me he didn't match the box. But now I'm tempted to fill in the screw holes and repaint him.
oh yeah, it felt ironic doing 'surgery' on Ratchet.

also forgot to mention that when it alt mode the red on his arms is now inside, so it's green exposed. Which is funny, that means the photo of the vehicle is from Ratchet with his arms switched one way, and the photo of the figure is one with his arms switched the opposite way.
Think I may have to definitely repaint him at some point.