questions before buying Razer Blade 15 i7-12800H 16GB/1TB SSD 15" QHD 240Hz RTX3070Ti

HI,
I am about to buy this model:


Razer Blade 15 i7-12800H 16GB/1TB SSD 15" QHD 240Hz RTX3070Ti

however i have a few questions about it. I would really apreciate it if you could help me out :)

1. Is the ram upgradable?
2. Is there an option where I could get rid of the logo on the lid? ( i am in interior designer and my customers will propably not like that one)
3. How does it charge? USBC?

Since I am rendering interior scenes ( via cinema 4d + arnold) ad always on the go, I thought it would be a good option to buy this laptop. better have a nice CPU and later down the road add a egpu into the system. does that make sense? is there a cheaper alternative? the Blade 14 is also interesting but the cpu (9 6900HX) doesn t seem to be as efficent, am i correct?

thanks for the help and enjoy the final days of the year!