Suspected SIP issue - User Folders

Hi All,

I'm trying to run the following script on El Cap to do user folder redirection:

#!/bin/sh

# Determine USERNAME variable

username=$(ls -l /dev/console | awk '{print $3}')

# Determine NETHOME variable

netvol=$(dscl '/Active Directory/DOMAIN/All Domains' -read /Users/$username SMBHome | cut -d'' -f4)
netfolder=$(dscl '/Active Directory/DOMAIN/All Domains' -read /Users/$username SMBHome | cut -d'' -f5)
nethome=$(echo "/Volumes/"$netvol"/"$netfolder)

# Redirect the Documents folder

if [ ! -d $nethome/Documents ]
    then
        mkdir $nethome/Documents
fi

rm -Rf /Users/$username/Documents
ln -s $nethome/Documents $HOME/Documents

# Redirect the Desktop folder

if [ ! -d $nethome/Desktop ]
then
mkdir $nethome/Desktop
fi

rm -Rf /Users/$username/Desktop
ln -s $nethome/Desktop $HOME/Desktop

# Redirect the Downloads folder

if [ ! -d $nethome/Downloads ]
then
mkdir $nethome/Downloads
fi

rm -Rf /Users/$username/Downloads
ln -s $nethome/Downloads $HOME/Downloads

exit 0

The issue I have is with the rm command lines, I get permission denied. Has anyone else seen this with deleting User folders? and if so, is it a SIP issue, and is there a way around it?

I have a lot of Multiuser lab machines for students, and I'm trying to stay away from Portable Home Directories.

Thanks,
Tim