IS there a way of setting up a seperate root blog for each domain in the multi domains

I have 5 domains

http://www.project365.com.au
http://www.project365.org.au
http://www.project365.net.au
http://www.project365.biz
http://www.project365.mobi

i want the abilty to create a sepertae ladning page for all of these but use the domains in my multi domain to do this.

how can i achive this, eg can i use domain mapping tool and just create a new blog and point to that one of will this stuff up the sub blogs under this

Ross