Love the idea and hope you are successful. I really think there is a lot of value to be unlocked in sharing/renting tools. In my area we have a tool library which is handy.

Some ideas: - I would focus a lot of effort on making it incredibly easy and intuitive to list things. This is one of the primary barriers to me when using these types of apps. - maybe future idea would be to list things from Home Depot or other stores to expand the number of rentals that are available.