Here is a script to put your typo3 setup together using a single typo3 installation and symbolic links. You'll need ssh access to put this on your server, then you need to create the folder and run the script there in.

Or something like that... decypher the code to make sure you get it right. It's been a while since I did it myself.

#!/bin/bash
#
# typo-setup.sh - script to automate the creation of a typo site
#
# Copyright (C) 2003 - Jinn Koriech
#
# This code is released under the terms of the GPL licence
#

echo "This script is to be used from within the folder which"
echo "you intend to setup Typo3.  The folder nesting should"	
echo "be like this:"
echo
echo " +-typo3"
echo '  +-typo3src'
echo '  +-dummysite'
echo '  +-[user]'
echo '   +-public_html'
echo
echo "You need to be in 'public_html' in this case to run"
echo 'the script correctly.'

if [ "${1}x" == "x" ]
then
	echo
	echo "  IMPORTANT: You did not provide a username for the file permissions to be adjusted to."
	echo "  USAGE: typo-setup.sh \"username\""
	echo
	exit;
fi

TYPO3_SRC="../../typo3_src" # the relative location of the typo3_src symbolic link to the real typo3_src folder
DUMMYSITE="../../dummysite" # the relative location of the skeleton site
WEBUSER="web"               # the user as which the web server runs
USER=$1

if [ -h $TYPO3_SRC -a -d $DUMMYSITE ]; then
	echo 'Starting in 5 seconds.  This is your last chance to abort.'
	sleep 5

	ln -s $TYPO3_SRC/t3lib t3lib
	ln -s $TYPO3_SRC/tslib tslib
	ln -s $TYPO3_SRC/typo3 typo3
	ln -s tslib/media media

	ln -s tslib/index_ts.php index.php	
	
	ln -s tslib/showpic.php showpic.php

	mkdir fileadmin
	mkdir fileadmin/_temp_
	chown $WEBUSER fileadmin -R
	chgrp $USER fileadmin -R
	chmod g+w fileadmin -R
	
	mkdir typo3conf
	cp -r $DUMMYSITE/typo3conf/* typo3conf/
	chown $WEBUSER typo3conf -R
	chgrp $USER typo3conf -R
	chmod g+w typo3conf -R
	
	mkdir typo3temp
	chown $WEBUSER typo3temp -R
	chgrp $USER typo3temp -R
	chmod g+w typo3temp -R
	
	mkdir uploads
	mkdir uploads/pics
	mkdir uploads/media
	mkdir uploads/tf
	chown $WEBUSER uploads -R
	chgrp $USER uploads -R
	chmod g+w uploads -R

	cd ../
	chmod 0755 public_html

	echo
	echo "Assuming that everything has gone this far, then your job now is to prepare the database.";
	echo 

else
	echo
	echo 'It appears you are not in the correct folder.'
	echo 'Please check and try again.'
	echo	
fi