Weight-wise, where are we? Well the basic chassis weighs just eight pounds, though the bulk of the weight in electrical air vehicles, like cars, lies in the batteries and motors that are yet to be fitted. With road vehicles you can be fairly liberal with these goods, but in aircraft in particular there is a diminishing return from simply adding more packs of batteries in an effort to create more lift from larger motors.
The build philosophy therefore is strictly to start light and to go lighter, and as a part of that effort the comparative weight of the airframe has to be almost negligible. We can go part way toward that in alloy, but much further with carbon-fibre.
But then Rome wasn't built in a day was it... even in brick?
