A:AnswerMine got a bit warm during basic usage, even with the fans on. It's something I wouldn't really worry about, but seems like thermals could've been better.
A:AnswerOnly the back USB-C port is used for charging, and as long as you have 5vdc you are OK. You will in no way charge as quickly as from the supplied HP charger, but it will charge as long as your car is on. Some newer 2014 plus vehicles have off charing, but I would not leave my laptop plugged in if away from the car for any serious amount of time. Since your laptop will not jump your cars battery.
A:AnswerHP has given no indication they're doing this one in copper. It looks like they are trying to narrow down the line some at this point with fewer builds and options. The copper is definitely cool but the silver is a stunner in its own right. Absolutely gorgeous machine.