I have been farming for parts to finish my E nest. I have reached stage 8 of lvl 3, I have everything, but it keeps saying that I don't have engine parts. I have a green engine in the houses gear, but it keeps saying that there isn't any engine parts in the house. I have considered that it might be that I need a lower quality engine, but I don't think that it is that problem. If you know anything, let me know. I hope this gets fixed soon, I have a wall to make after this, I am saving all the remats I own to finish the wall, but the house is of more concern.

I too have this problem. No idea what is going wrong.

Well, hrm. I tried Green engine parts and it worked.