I'd agree with some of the comments on the Lowtech website, that's there's no "universal" vehicle, whether it be petrol powered, electric or human. Like one of the posters I have 5 "bikes", each of which I use for different purposes. I have two electric trikes, both with 250W motors, one is fast on the flats, but won't climb hills, the other is vice versa. I seldom use my electrikes for local shopping (ie 5km or less), preferring an MTB with a big plastic box on the back.
Perhaps the way of the future might to go for a modular design where eg carrying capacity can be added as required (or removed when not - say a trailer), photovoltaic panels can be detached for short distances, different battery capacities can be switched around for different purposes. Paradoxically, small batteries may be more useful for longer trips if there are solar panels. I've never flattened my batteries since I added the solar panels, because I use the motor so little (mostly take offs and hills), so even smallish photovoltaic panels (measured output roughly 12 watts on a good day) will top up the batteries. Bigger batteries over shorter distances without panels would enable the rider to use the motor more. And so on.
I think an eVelo is a good idea, but I suspect there will be a bit more work to do.
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Many people feel their lifestyle has a high price, but they're quite cool with that .. as long as somebody ELSE pays the price.