New side panel done. For a first timer and with hughe thanks and help from my little brother I think it's a fine result.
At the very top left there's some honey comb cuts left from the original panel where the fan mount was. We had to leave a bit there to get some few mm's left so we could put silicone on the backside to make the plexiglass bind. However I'm planning to buy some matt enamel paint (I though I had more but it was all dryed up), to touch up the edges so they don't look so rough.
I also added a new NZXT Sentry Mesh fancontroller to the front, and it looks super and flows great with the existing mesh front.