Looks a good video, I think it's important to make sure the tang on the float just touches the spring loaded pin on the float valve, but doesn't depress it when it's at the correct height.
However, I don't agree it's a good idea to loop the carb overflow pipe 'up and over' as he's got it...if you look at it, the fuel level would have to be pretty high before it would run out of the overflow. Effectively, it's increased the overflow height, there's a chance it would flow into the reed block/crankcases before it could flow out of the overflow pipe.
Loop.JPG