Questions about 60000 PPD build 2x arima

[terramir]

Help I'm getting lost in the thread's, now there talking about Wu errors!

One case 8 water-blocks old TC4 bottoms I'll make my own tops
One aquaextreme z50
two arima F-3000 boards
One populated with the 8347 he from the givaway (although At first one is going in the other board)
and well One HD
one either x550 or HD 4550 or x800 and
well the other one will have a usb flash or an mini 2gb ssd for booting

Here are my questions:
#1 when I make the WB can I forget the top heat-sink holders and just use two screws, since I'm making my tops myself could I use just screws and the backplates?
#2 What sort of power supply can I use since I'm using 2 boards, can I use 4 rails 2 12V rails on some are 20A and then 2 more are like 25A I mean 2x 20A *12= 440W the 8347 he are rated 55W so the draw total should be less than 300 right for that board, the other board will use more because I might be using the 8354's or the 8360's
#3 how are the temps watercooling one quad CPU Arima, I know some peeps here have done so, and with what cpu's, how many rads and what will I have to do to make this work for 8 cpu's and how sensitive are these things to heat?
terramir

Edit add question #4 What are those empty things we have in the second power connector, can anyone here elaborate on that?,
also #5 server power supplies with those wierd connections in the back , are cheap at times, what do I need to make those work (think I need a 5V board for the HD's anyone know about those?