Progress update: I applied what @Hymil said and softened the main body, but haven't completly rounded it off and removed the pinching at the edges. For the textures i wanted to go for a more realistic approach, but when it came to baking the textures i've run into a few problems, tried to fix them but i can't seem to, so…
Noted. I'll fix that. Thanks. my final decision was to remove the lower engine, it allows for retaining the shape of the engines while removing the issue.