I think a lot depends on how you hunt and where, etc. Mrbb is absolutely correct about movement getting you busted. If you're downwind of an animal, it isn't likely to catch your scent but if it sees you move, you're busted.

Reading Nomercy's description of how he hunts, scent wouldn't be a big factor in that (if I read his description correctly), a coyote would have to cross a shooting zone before it could get downwind of him. In that particular type of situation, movement would be more dangerous than scent for alerting an animal.

As for the OP's question, it sounds like your setup involves only a small opening (above the shooting rail) and any movement not in front of that shooting hole is covered. It sounds like there wouldn't be any light behind you so it would be hard for an animal to see you or your gun in your treestand. It sounds like you're probably okay but camo paint or wrapping is fairly inexpensive. If you still want another opinion, have a buddy watch and photograph you in your treestand from a distance you expect to see animals at and see for yourself what is visible and what isn't.