Re: Liability issues
I would advise that you build a couple of bikes & learn as much as you can before just sending your first bike out into the world for someone to get hurt on. (all the info you need to learn is here on this furum).
These kits look easy to install, but there are many things that experienced builders do to them to make 'em as safe & reliable as possible.
Most of the bigger problems come from the chain tensioner & rear sprocket installation.