This is a detailed walkthrough of how I built my newest camper setup for my Honda Element. I use beginner techniques and no prohibitively expensive tools so hopefully it can be useful regardless I skill level.

Here are some of the items I used to build the camping setup:
3" Memory Foam Mattress https://amzn.to/3Oa0Lnr
36" Drawer Slides https://amzn.to/3EcZtnf
Folding Shelf Brackets https://amzn.to/3JHTVCf
Picture hanger hardware https://amzn.to/3uKguSF

Tools:
Dewalt Drill and Impact Driver Set https://amzn.to/3vh7EuB
Dewalt Jig Saw https://amzn.to/3Od1rbx
Dewalt Random Orbital Sander https://amzn.to/3OckT8v
Dewalt Corded Circular Saw https://amzn.to/3viNGjc
4pk Squeez Clamps https://amzn.to/3uIp5Fi