Erm, make the engine part flat again. Due to a rendering bug, the engine glows would pierce the hull (trust me, it looks bad), so you'd have to stick to the rear being flat until this bug is fixed.
Edit: to see the engine rendering bug, you need an external look on a Myrmidon, and with a bit of rotating, you can see how the engine glow is partially obscured by the hull, but then re-appears once it's cleared the side of the Myrmidon.
Btw, in an unrelated note to the source code people, the sun glow drawing code seems to be good (either the whole glow is drawn, or none of it, if it's obscured).