Hello all. I have a couple of questions regarding the audio rack OASE-A4. This fall I want to upgrade from my 950 and 5 – 200’s (5.1) to 7 – 200’s. (7.1) Currently I have a stack of 2 – 200’s and another stack of 3- 200’s. Will it be ok to stack 4 – 200’s and with a usable shelf height of 8.75”, will I have enough room and cooling to have a stack of 4 – 200’s? Also if I add 2 shelves to the 4 shelves on the main unit (total of 6 shelves) will I be able to use casters or will the whole unit just be too unstable? I was thinking about putting 4-200’s on the bottom self and the next 3-200’s on the next self. I also currently have a 950, HD tuner, satellite receiver, DVD, and I would like the extra shelves for added components in the future. Thank you.