selecting domain

Im wanting to create an unattended slipstreamed windows xp cd that will let you select which domain you want to use before running setup e.g.

@rem SetupMgrTag
@echo off

rem
rem This is a SAMPLE batch script generated by the Setup Manager Wizard.
rem If this script is moved from the location where it was generated, it may have to be modified.
rem

@ECHO off
cls
:start
ECHO.
ECHO 1. domain1
ECHO 2. domain2
ECHO 3. domain3
ECHO 4. domain4
ECHO 5. domain5
ECHO 6. domain6
ECHO 7. domain7
set choice=
set /p choice=Type the Number to select domain
if not '%choice%'=='' set choice=%choice:~0,1%
if '%choice%'=='1' set AnswerFile=.\domain1.txt
if '%choice%'=='2' set AnswerFile=.\domain2.txt
if '%choice%'=='3' set AnswerFile=.\domain3.txt
if '%choice%'=='4' set AnswerFile=.\domain4.txt
if '%choice%'=='5' set AnswerFile=.\domain5.txt
if '%choice%'=='6' set AnswerFile=.\domain6.txt
if '%choice%'=='7' set AnswerFile=.\domain7.txt

ECHO "%choice%" is not valid please try again

set SetupFiles=F:\i386

F:\i386\winnt32 /s:%SetupFiles% /unattend:%AnswerFile% /copysource:lang

example for domain1.txt :-

;SetupMgrTag
[Data]
	AutoPartition=1
	MsDosInitiated="0"
	UnattendedInstall="Yes"

[Unattended]
	UnattendMode=ProvideDefault
	OemPreinstall=No
	TargetPath=\WINDOWS

[GuiUnattended]
	AdminPassword=*
	EncryptedAdminPassword=NO
	OEMSkipRegional=1
	TimeZone=85

[UserData]
	FullName="User"
	OrgName="organisation"
	ComputerName=*

[Display]
	BitsPerPel=16
	Xresolution=1024
	YResolution=768

[TapiLocation]
	CountryCode=44
	Dialing=Tone
	AreaCode=0114
	LongDistanceAccess="9"

[RegionalSettings]
	LanguageGroup=1
	SystemLocale=00000809
	UserLocale=00000809
	InputLocale=0809:00000809

[Branding]
	BrandIEUsingUnattended=Yes

[URL]
	Home_Page=http://intranet

[Proxy]
	Proxy_Enable=0
	Use_Same_Proxy=1

[GuiRunOnce]
	Command0="rundll32 printui.dll,PrintUIEntry /in /n \\domain1\hp4300"

[Identification]
	JoinDomain=domain1
	DomainAdmin=Administrator
	DomainAdminPassword=password

[Networking]

would this work?

also is there a way of once the installation is finished it logs a user into windows that has a domain account, e.g. fred.bloggs logs in?

if so is there a way i could create a script file that would ask me which user i want to login, but this wouldnt be a choice of 1-10 more like free choice e.g. it could be any name (as long as it has an account on the domain the computer is attaching to)

Thanks in advance

Superblades