I like to make life difficult for me ;)

I've not seen those web site before but it's at an exciting pace these days. The likes of Tesla (Elon Musk) shows the leaps and bounds made with electric development, especially in battery/cell capacity.

I'm waiting for the day that someone develops atmospheric energy propulsion (akin to what Nikola Tesla /Henry Moray was working on). Though I think you need a very good 'earthing' which could be quite difficult when you're flying above it lol.