Thanks, Bill.
I intend to provide GFCI protection at the source, and didn't think about the reduction in burial depth for 120 volt ckts. My muscles thank you.
I will install a timer at the panel.
As far as the WP cover, I don't know if the dome on the covers will acccomodate the larger twist-lock plug. I remember seeing a single receptacle cover that actually had an o-ring or gasket that sealed against the face of the inserted plug.

BTW Bill,
I may be coming to the Electrical Expo. on the day Joe is giving his presentation (Wed.?) how about yourself?