Cataclysm on android

So far, my experience of cataclysm on android has been amazing, but when i tried adding a wooden frame to the first one i had started the vehicle with, the option to install a frame wasn’t there, i had everything i needing, my profession starts with a integrated toolset and solar panels, so i have the tools, why can’t i build a frame onto the “vehicle”?

If you want to expand vehicle, you need to put new frames near existing frames.