Sorry, I realized I forgot to add translations for the car's internal functions. I will add the translations and update the mod later.
Here are the answers to your questions:
1. For the assemblers in the base, you need to capture the corresponding wild assemblers first to activate them. (Surrounding them with buildings is ineffective.)
2. Wild assemblers can be captured by surrounding them with 10 buildings. Wait a moment, and they will activate (no power required).
3. Regarding the car shop: First, place a car from your inventory onto the ground, then press Enter to enter the car. In the top-left corner of the screen, you’ll see a rocket silo icon. Click it, and you’ll find a button with an [Iron Ore] icon. Click that button to buy minerals. (This part is still missing English translations.)
I am still working on some bugs related to the replica system. I will update the translations and the mod later.