Idk about the whole steel roof thing, I would much rather have a minimal aluminum frame with a simple tray on the trailer than a solid steel body with a closed trailer. There had better be a cassette between the motors and the drive wheels or else that thing is going to be prone to stalling out if there is no way to downshift if you can’t crank over the chainring. It’s especially important to make sure that the vehicle doesn’t stall because it doesn’t look like there’s any way to kick off the ground while riding or pull it from the front. You couldn’t push it because it would jack knife so there should be some kind of place to grab and pull the vehicle from the front. Furthermore, those tires look like 2.5 inch tires, you should really get some good tires if you’re going to have 6 of them rolling, the more rubber the vehicle needs to fold against the ground the more energy is wasted. You should really get thinner urban wheels to save energy while driving on roads.