Planet CakePHP

So, i was wondering if some one could clarify following occurrence and maybe suggest how I could tackle this.

sorry for the weird coloring of the code

Let me explain the set up first. I have wamp server installed and it is located physically on one hd and then my development files are located on separate hd. So i have added alias to access specific dev folder

in httpd.conf i have following

ServerRoot D:/Program Files/wamp/bin/apache/apache2.2.11  
Listen 80  
ServerName localhost:80  
DocumentRoot D:/Program Files/wamp/www  
  
    Options FollowSymLinks  
    AllowOverride None  
    Order deny,allow  
    Deny from all  
  
  
    Options Indexes FollowSymLinks  
    AllowOverride all  
    Order Allow,Deny  
    Allow from all  
  

following is in seperate conf file and included into httpd.conf

Alias /project_birthday_planner "E:/Development/--- Projects-Full/PROJECT - BirthdayPlanner/trunk/"  
  
    Options Indexes FollowSymlinks MultiViews  
    AllowOverride All  
    Order allow,deny  
    Allow from all  
  

in my E:/Development/--- Projects-Full/PROJECT - BirthdayPlanner/trunk/ i have my cakephp directories and files

here is the problem

my mode rewrite is turned on and my htaccess files for following cakephp folders are as following,

root of the cakephp

  
    RewriteEngine on  
    RewriteBase /  
    RewriteRule ^$ /app/webroot/ [L]  
    RewriteRule (.*) /app/webroot/$1 [L]  
  

*\app*

  
    RewriteEngine on  
    RewriteBase /  
    RewriteRule ^$ /webroot/ [L]  
    RewriteRule (.*) /webroot/$1 [L]  
  

*\app\webroot*

  
    RewriteEngine On  
    RewriteBase /  
    RewriteCond %{REQUEST_FILENAME} !-d  
    RewriteCond %{REQUEST_FILENAME} !-f  
    RewriteRule ^(.*)$ index.php?url=$1 [QSA,L]  
  

when I access /project_birthday_planner i get following error 404 Not Found

**Not Found**  
The requested URL /app/webroot/ was not found on this server.  

if i set DocumentRoot to my cakephp folder or move cakephp folders and files to initial DocucumentRoot folder, all fires up and works.

question is
how do i tackle this issue, is this something that inherently comes with the use of apache Alias
or am I missing some piece

should this set up be tackled via VirtualHost then?

thank you so much in advance