I prefer to work in wood...

The key is the front edge of the top needs to be supported very close to where the extra curves are in the roof. This is where the aluminum is stronger because of folds.

I built this many years ago, and it has worked out just great. $30 bucks in lumbar, hardware and beer, it was a fun afternoon project.

 

my storage rack is a wall with a blanket on the floor next to it