Hi Mohd Noh,
Thanks fo your reply.
I will take some pictures and attach them, but it will take some time.
The problem with your suggestion is that there are no holes at all for a 200mm fan.
There are 2 sets of holes for 2 120mm side by side fans and 1 set of holes with 155mm spacing.
The 180mm fan has 1 165mm spacing (I measured the one I bought).
I would assume that the 200mm fan would require a 185mm spacing for the holes.
So unless I get some suggestions I will have to use just 120mm fans.