I think a lot has happened in the past few years, so that it's worth trying an improved motor and battery system.
Winter is a great time to get geared up for the next season, and there might be some seasonal discounts to take advantage of right now!
Hmmm... Communting to work is fun for people? I want to live where they live.
Keep the car for weekend cruising, the bike probably makes the boring commutes more fun than a car would.
I built an bike 6 or 7 years ago but only took it once to work (a 20 mile commute). It was underpowered and under-batteried but it was an interesting starting point. I mean to try it again.