Cooling Phanteks P300

[Henz707]

Hey guys!

I have two questions and I was hoping that you could help me with them.

After some questionable decisions I have ended up with a Phanteks P300 case and a CPU cooler (Dark Rock 2) that is too big for it. It should have fitted but it didn't so now I have sidepanel that is about 4 mm open (see the picture).

Question nr 1: Should I keep it half open like that, should I open up the whole panel the same amount (~4 mm) or does anyone have any other good ideas?

 

I also need some case fans to cool it. It would be nice to sync the integrated RGB light with those too but my MOBO does not have a RGB controller. Case can house 2 x 120/140mm in the front, 1 x 120/140mm on the top and 1 x 120mm rear.

Question nr 2: What are my options for syncing the fan RGB with case RGB?  Only obvious one is using Phanteks Halos but they cost ~12€/pc (~13.90 USD / ~18.30 CAD) here and I would also need to get the fans and I would be left with the integrated hardware control button - no software control. 

Thanks in advance!
-Henrik