Hello just to say i have a do it your self fusion drive on my new 2.3Ghz i7 Quad Core Late 2012 Mac Mini and had to share this new found info 
Got a stock mid model Mac mini after playing with it for few day i decided to upgrade the memory to 16Gb and since i had it almost open decided to keep going a ad my Intel 520 SSD 240Gb in the second drive bay i used a OCW cable for the SSD.
Put all back plug in all cables and power on command+r at start up and installed fresh OSX on the SSD didn't think off the Fusion much anyway few minutes later Mac OSX loads and i put most of my used apps and Carbon Copy Cloner so that i make a copy on a USB Flash drive.
(for my use a 16Gb Corsair Voyager GT nice all back up great)
Few days later i decided to try the back up USB Flash drive and test if all boots good,
took it's time as it's only a USB 2.0 (USB 3.0 Flash Drive on my shopping list) the OSX loads great then short time after a message pop's up saying the internal hard drive's are not in order or something like that "fix" or "not" with disk utility so i click "Fix" and i see what it's disk utility doing and the two drives become one my 240Gb Intel 520 SSD and the stock Hitachi 1Tb drive in one Fusion done very fast (warning if you try the same make sure you have all of your data backup before doing so)
now that i see only one hard drive and total size of 1.24Tb and i go ahead and open Carbon Copy Cloner and start coping back to the newly made fusion drive few minutes later i restart the Mac Mini from the internal drive this time and "Bob"s your uncle" as fast as the SSD but this time it's both in one Fusion, happy to see this working that i had to share it.
Uploaded some photo's too show the end Fusion Drive and the two drives in the system report.
Greetings from the land down under

Got a stock mid model Mac mini after playing with it for few day i decided to upgrade the memory to 16Gb and since i had it almost open decided to keep going a ad my Intel 520 SSD 240Gb in the second drive bay i used a OCW cable for the SSD.
Put all back plug in all cables and power on command+r at start up and installed fresh OSX on the SSD didn't think off the Fusion much anyway few minutes later Mac OSX loads and i put most of my used apps and Carbon Copy Cloner so that i make a copy on a USB Flash drive.
(for my use a 16Gb Corsair Voyager GT nice all back up great)
Few days later i decided to try the back up USB Flash drive and test if all boots good,
took it's time as it's only a USB 2.0 (USB 3.0 Flash Drive on my shopping list) the OSX loads great then short time after a message pop's up saying the internal hard drive's are not in order or something like that "fix" or "not" with disk utility so i click "Fix" and i see what it's disk utility doing and the two drives become one my 240Gb Intel 520 SSD and the stock Hitachi 1Tb drive in one Fusion done very fast (warning if you try the same make sure you have all of your data backup before doing so)
now that i see only one hard drive and total size of 1.24Tb and i go ahead and open Carbon Copy Cloner and start coping back to the newly made fusion drive few minutes later i restart the Mac Mini from the internal drive this time and "Bob"s your uncle" as fast as the SSD but this time it's both in one Fusion, happy to see this working that i had to share it.
Uploaded some photo's too show the end Fusion Drive and the two drives in the system report.
Greetings from the land down under

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