I'll be using my full ATX Gigabyte Z68 board. The only PCI cards that I will be using will be a 5770 graphics card and a gigabit LAN card. More than likely I will never use the remaining slots.
I have thought about placing the power supply on the top, but I am worried about heat. Also, if I use the full ATX board with the stock PCI slots, I will not be able to mount the power supply there, due to the motherboard needing the space and having to cut the panel.
The Laser Hive sells a full ATX kit that places the board lower in the case where it does not protrude into the top drive bay section. I thought about purchasing this, but wanted some feedback before I spent the $100 on it.
As for the fans, I thought about having two intake fans and two exhaust fans. Not sure which I would place in the front or rear yet. I'll be replacing the stock fans though with some Noctuas as the ones in the G5 are very loud.
Thanks for the input.