But Boli.....
If you duct from the sides then you are missing the point coldest air is at floor level. I know we are splitting hairs here and I really believe that either will work and in V12's case side ducting will probably be more user and space friendly. I had enough room in my scratch build monster to duct from the bottom and exit out the back. Th MB's are are high enough off the floor of the case that I dont have any acccess problems to my MB's. Wish I could say I planned it that way but I would be lying
Aardil