Generally, you need an access panel for the motor. You don't have to have one for the plumbing end, but you'll be happier if you do when it comes time for maintenance. As to what is required - I'm pretty sure the inspector will want to see the motor electrical hookup in the final, so that would need a panel. Probably wouldn't need to see the wet end in the final. What does the installation instruction sheet say? Local codes generally require it to be installed per the manufacturer's instructions.