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10kg is a long way to go, that's for sure. Composite fenders would help. The kick starter, kick stand, sub frame, and tank could all be replaced with light weight units. That might get it close. Tubeless would help, maybe. A composite headlight bucket would help, as would composite ears. Maybe a...
The Bauer stuff I have bought has been great. I own a few of their tools now.
I have two battery impact guns from Ryobi and while they are a spot on the weak side they both have been kickass. I just use a big breaker bar for breaking high torqued nuts/bolts, but the battery impact will blast...
There's an aluminized (relflective) padding we like to use on our hot rods. I forget the name of it. Works great for controlling hot and cold, but also helps with sound.
I went back and read the entire thread. I bet getting those dampers on helped!
Looks sweet! Those brakes I would think will be more than adequate, of course I am not sure how much battery load you will carry.
The girl is the right choice. All she has to do is keep the thing on the road. The less turning the better.
Scrub radius is called “scrub” for exactly why you think it is. For an efficiency vehicle I doubt you really want to incorporate it. At a minimum just space the wheel in as far as it goes.
As for camber run as little you can. Camber thrust is a form of scrub.
I see you are using a standard kart spindle now. That is the right move.
Run those in the lowest Ackerman setting possible (will explain). Generally that means the holes furthest from the center of the chassis. With your rack setup you will have to measure this though. Just measure the width...