First it would be best if you get a grip on the perspective and view you want to achieve, the whole ship seems to have some angle ambiguity on the lower part. Try to make a simple sketch on how the ship looks from the side, back, up and down. It doesn't even have to be pixel art, just a doodle on paper so you get an objective notion of it's shape, not confused by the angled view.
Turning it on the y axis like you want would involve more than flatly turning 45° the already angled up sprite, like pixelbit it is showing here.