Case fan placements

Hey all, im new to these forums and was seeking suggestions and help on fan placements. Here was the setup i was thinkin about...

Mid size case
plexi side, font and top

Front Pannle (custom cut obviously): 2x 120mm blue LED fans, with floppy along the side, verticle. Both fans as intake

Top: 120mm Blue LED Exhaust

Back: 92mm Exhaust

I heard that if you put a T in the air flow it is not good, but blowing air onto the motherboard is also good...so i dont know if i should have a fan on the side or not. My cusin is doing all the cutting he is really good so its not going to be like a hack job or anything. Just how efficient is that fan set up??
Any suggestions would be awsome!!