Re: The questions remain ...
I can't answer most of these questions, but I can answer question 2 / 2a.
The electricity comes from the grid, so in the UK that would mean mainly coal / gas fired power stations. Even though coal is really bad, at the scale power stations work it still pollutes less than your average car petrol / diesel engine (probably better than the best too).
I can guess at some of the others.
1/1a probably about the same as a 'normal' vehicle if you don't include the battery pack (you did split it out yourself)
4/4a see answer to 1
3 this is the real crunch and I don't even have enough data to guess.
Would I want an EV? Well, not a charge up from the mains job which is what you can get at the moment. If petrol stations sold hydrogen I would consider a fuel cell car as that gets around the main draw back of limited range in current EVs.