You can do it how you mentioned but got from the motherboard will be more efficient.
How would I do it as I have asked? would the SATA cable from the front plug into the eSATA port?
All of the ports on my Mobo are full - 2 drives in RAID 0, 2 drives in RAID 1 and a boot drive. The only alternative is to buy a RAID card, which I am considering anyway. Any suggestions for a good 4 port internal RAID card for PCI-e x1?