You can build a simple wood frame to hold your tools. Or add various PVC pipes so each tool has a home.
Another idea I have seen on Pinterest is to use pool noodles to help hold long handles.
are you wanting to know how to build the whole box/tool storage? https://www.youtube.com/results?search_query=diygarden+sheds+for+tools RACKS to put in shed? https://www.youtube.com/results?search_query=garden+tool+storage
Here's a post about making squash growing rack out of pallets.
What kind of boxes?
By using wooden window boxes and staggering them at different heights, reinforced by heavy fence posts. They might require more attention than most as far as watering though, at least in the southern zones during summer.