Hi. Great job on the game so far. I have researched the below options and the slots are not present to build;
Make Hood
Make Tires
Make Brakes
Make Trunk
Make Valves
Also the following stay greyed out after being researched;
Make FuelTanks
Make Starter Motor
I have also been noticing that even though I am making everything I can, There are still full components still being imported. I am using all the starter items and haven’t gotten into the upgraded equipment.