thermalright axp-100

I plan to build this as soon as my case arrives. I can see myself and have been made aware that there will be airflow problems so I plan to mod the case but I'm not sure what fan or how many fans to add or what to do about GPU ventilation. I plan to cut a hole up top with a hole saw for a 120mm...

I know these were a prototype awhile back but it looks like they're for sale now on Tmall, pure copper and graphene coated. I'm a bit suspicious of this being a copper coating though since literally everything including the screws is copper coated...