These are very helpful for the people that are learning to build ships, even tho I prefer to do my engines myself.
The missing star is due to lack of either logic or ice cover on the system blocks.
One thing id suggest is using the new metal bar corners to smoothen the jagging on the slabbed engines.
The lack of ice cover is intentional, however, I forgot the reasoning in the description (will update that), it is so the thruster plume effect is clearly visible, which it wouldn't be if there was a transparent cover, due to changes made with the intent to make the plumes less obnoxious at long ranges.