For a start, the Grievous looks AMAZING! I didn't really focus on your gunship, as your Grievous is much better than Lego's official one, which could have been better, considering it has one-of-a-kind parts, and plus, yours looks much deadlier than LEGO's, yours looks especially deadly from the back! And, by the way, what parts did you use for the arms?
awesome job to upgrade your ship i would put smooth plates on the wings and completely on the top and add those white stripes that were shown on the tv show. i promise you it will look alot better. also the coc pits could be a little better. if you take my advice than your ship will be one of the best on moc.by the way nice job