Modding Xaser III

[IJAHman]

I have a Xaser III which (basically an old)is a great Full tower chasis but the problem is the small fans (i don't know whats the size, but it has 7). I'm thinking of upgrading the fans (not all of it) into 120mm, but I'm sure it'll not fit with the fan clippers (included i the package). Any idea how to?

Maybe change the two exhaust fans blowing at the back and the two in the side panel.

 

[IJAHman]

The Themalright HR-02 Macho I bought was too big that it will not fit on my case (thermaltake xaser III). The side panel should be remove in order to be able to close my case. But attached with the side panel are 2 80mm intake fans. Is it fine if I just get the side panel and close the case? or should I leave it open?