That's cool! Glad you shared the pics. How do those big wide tires feel compared to a standard size tire? I pedaled one down the isle at wally world but couldn't really get a good feel of the bike. What air pressure do they use? I bet those balloon tires make for a cushy ride. Perfect for cruisin the beach or park.
What is your average cruising speed? What will it top out at? What type of range do you get on a full charge? Build looks great!
He'll be OK center of gravity wise, the battery is the flat box on top of the rack not the bag on top of that, the bottom end is very heavy, and the kickstand holds it up.In your case you can either move the batteries or add weight. Your call. Trust me, you dont want a high center of gravity on a motorized bike.