Case modding for a 240 rad

Hi guys.

I'm looking to mod my old Lian li v351b to be able to take another 240 rad. I want to mount it in the roof of the case so I'm going to need to cut the case.

What's the best tool to be using do you think? A dremel or jigsaw?

Whichever you happen to own or feel most comfortable with tbh.

I'd probably use a jigsaw to cut the hole a little smaller than it needs to be (to allow for mistakes/non-straight lines) and then use a metal file to finish it.
Then again, that's probably because I don't own a dremel

I would use a dremel to make the first cut, then it is easier to use a jigsaw to cut the rest of it

Cheers guys