With NT is could be done using the winnt.exe /T: parameter. This was intended as a path for temp files but in reality it installed the OS in the same partition. Not sure if it still works that way for XP but worth a try.
/t[:tempdrive]
Directs Setup to place temporary files on the specified
drive and to install Windows 2000 on that drive. If you
do not specify a location, Setup attempts to locate a drive for you.
You can use TargetPath in the answer file to specify folder to install into.
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