I have a couple of 10.7 clients with two partitions on the internal disk. "Macintosh HD" with OS X 10.7.3 and a "Users-Volume" Partition with the user home folders.
I can't use Casper Imaging out of the box to partition the disk, because it has already two partitions and Casper doesn't seems to change anything.
For sure, I could walk from machine to machine and use the Carbon Copy Cloner feature to create the Recovery HD with an external disk. But I would love to find a way using Casper Imaging/Netboot.