OK I managed to install Linux Ubuntu 14.04.01 to the USB stick and setup a RAID1 using MDADM, along with a Samba share. All working rather well but I've decided I want to use my existing Crucial 64GB SSD from my other server as USB is too slow.
Because I can't boot from the ODD SATA port, I've ordered a PCI Express SATA 6Gbps controller card with 1 SATA port for about £21. I'm off this afternoon to see if I can track down a FDD 4-pin power to SATA power lead. Failing that a Molex splitter that I can connect a SATA power adaptor onto will also suffice.
On the noise front I was told this morning to; 'turn that box off, Daddy' by my 4 year old daughter as it was rebooting. So definitely too loud! As the machine has bedded in and the HDDs been installed there is definitely a consistent low frequency hum (pretty certain it isn't vibration noise) that is irritating and it is simply too loud for a front room environment. Hoping that as I move it to the office it will be lower down and therefore cancel out some of the noise. Fans are averaging at 9-10% based on what I am seeing from iLO.