How to make a Car Bed
Measure your Trunk/Backseat with Papers
This was quite easy for me because my mats come up, but the gist of this is to create a shape out of paper that matches your trunk size. Little gaps and holes are important to account for when creating your mattress
Draw the Stencil on your Material
I used an old tempur pedic foam mattress topper (boy was it comfy) and traced the stencil of my trunk onto it. I went a little over, rather than under, so that the mattress would fit snugly into the trunk.
Cut it
The last step is to cut our your mattress and put it in the trunk to see if it fits. It’s kind of a tedious process, but the closer you get to the outline the better it looks.