mac geekery

Does anyone have/can anyone create a script that does the following on a 10.5.7 computer?

a. Identifies the boot drive of a computer (assuming a MacPro here with 2 drives: a boot drive and a second internal drive used for data).
b. Checks the availability of at least X amount of free space on the boot drive. In my case I would look for at least 100Gb free (assuming a 50Gb WINDOWSVISTA image and leaving 50Gb free for future Applications).
c. Partitions the drive with a 50Gb back-end partition.
d. Runs the Winclone restore to the newly created partition.

I can see that a diskutil info disk0s2 will provide me with Total Size and Free Space but my scripting is not good enough to go any further.

I’d like to deploy this via ARD.