Dell C6100 Question

I read the information that you had with a previous customer regarding the C6100 and found it very useful.  I was wondering if you could answer more questions for me.

I am considering buying one of these.  My purpose is going to be different then what is intended for.  i would like to build 4 seperate systems in one box.  Is that possible?

I read that in order to install the Operating systems, that the onboard intel ICH10 would not work. In order to do so, I need to get the raid card to divide them up. My next question is, How many RAID Mezzanine Cards can I put in the Dell C6100?  I read, don't remember where, that the c6100 houses only 2 RAID Mezzanine Cards?  Is that true?

Thanks in advance