Installed a shelf into our 5er basement. Yes, the 5er had/has a huge basement storage area... but alot that space was wasted as you could only use the floor. Not a problem anymore!!
Mod was pretty easy - garage door metal for the framing - 1/2" plywood for the shelf...
Now I've got room to pack even more "stuff". (The DW isn't so sure that this is a good thing... :hihi